1
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Rahman IKMR, Uddin SZ, Yeh M, Higashitarumizu N, Kim J, Li Q, Lee H, Lee K, Kim H, Park C, Lim J, Ager JW, Javey A. Gate Controlled Excitonic Emission in Quantum Dot Thin Films. NANO LETTERS 2023; 23:10164-10170. [PMID: 37934978 DOI: 10.1021/acs.nanolett.3c02456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
Formation of charged trions is detrimental to the luminescence quantum efficiency of colloidal quantum dot (QD) thin films as they predominantly undergo nonradiative recombination. In this regard, control of charged trion formation is of interest for both fundamental characterization of the quasi-particles and performance optimization. Using CdSe/CdS QDs as a prototypical material system, here we demonstrate a metal-oxide-semiconductor capacitor based on QD thin films for studying the background charge effect on the luminescence efficiency and lifetime. The concentration ratio of the charged and neutral quasiparticles in the QDs is reversibly controlled by applying a gate voltage, while simultaneous steady-state and time-resolved photoluminescence measurements are performed. Notably, the photoluminescence intensity is modulated by up to 2 orders of magnitude with a corresponding change in the effective lifetime. In addition, chip-scale modulation of brightness is demonstrated, where the photoluminescence is effectively turned on and off by the gate, highlighting potential applications in voltage-controlled electrochromics.
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Affiliation(s)
- I K M Reaz Rahman
- Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Shiekh Zia Uddin
- Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Matthew Yeh
- Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Naoki Higashitarumizu
- Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Jongchan Kim
- Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Quanwei Li
- Department of Chemistry, University of California, Berkeley, California 94720, United States
- Kavli Energy Nanoscience Institute at Berkeley, Berkeley, California 94720, United States
| | - Hyeonjun Lee
- Department of Energy Science and Centre for Artificial Atoms, Sungkyunkwan University, Natural Sciences Campus, Seobu-ro 2066, Jangan-gu, Suwon 16419, Gyeonggi-do, Republic of Korea
| | - Kyuho Lee
- Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - HoYeon Kim
- Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Cheolmin Park
- Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Jaehoon Lim
- Department of Energy Science and Centre for Artificial Atoms, Sungkyunkwan University, Natural Sciences Campus, Seobu-ro 2066, Jangan-gu, Suwon 16419, Gyeonggi-do, Republic of Korea
| | - Joel W Ager
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Materials Science and Engineering, University of California, Berkeley, California 94720, United States
| | - Ali Javey
- Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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2
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Ossia Y, Levi A, Panfil YE, Koley S, Scharf E, Chefetz N, Remennik S, Vakahi A, Banin U. Electric-field-induced colour switching in colloidal quantum dot molecules at room temperature. NATURE MATERIALS 2023; 22:1210-1217. [PMID: 37537354 DOI: 10.1038/s41563-023-01606-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 06/14/2023] [Indexed: 08/05/2023]
Abstract
Colloidal semiconductor quantum dots are robust emitters implemented in numerous prototype and commercial optoelectronic devices. However, active fluorescence colour tuning, achieved so far by electric-field-induced Stark effect, has been limited to a small spectral range, and accompanied by intensity reduction due to the electron-hole charge separation effect. Utilizing quantum dot molecules that manifest two coupled emission centres, we present a unique electric-field-induced instantaneous colour-switching effect. Reversible emission colour switching without intensity loss is achieved on a single-particle level, as corroborated by correlated electron microscopy imaging. Simulations establish that this is due to the electron wavefunction toggling between the two centres, induced by the electric field, and affected by the coupling strength. Quantum dot molecules manifesting two coupled emission centres may be tailored to emit distinct colours, opening the path for sensitive field sensing and colour-switchable devices such as a novel pixel design for displays or an electric-field-induced colour-tunable single-photon source.
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Affiliation(s)
- Yonatan Ossia
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Adar Levi
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Yossef E Panfil
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Somnath Koley
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Einav Scharf
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Nadav Chefetz
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Sergei Remennik
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Atzmon Vakahi
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Uri Banin
- Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel.
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem, Israel.
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3
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Wang C, Fu J, Wei Q, Ren H, Liu Q, Zhou L, Wang P, Li M. Electric-Field-Enhanced Electroluminescence Color Tuning of Colloidal Type-II Tetrapods. NANO LETTERS 2023. [PMID: 37285458 DOI: 10.1021/acs.nanolett.3c01408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Color-tunable electroluminescence (EL) from a single emitting material can be used to develop single-pixel multicolor displays. However, finding materials capable of broad EL color tuning remains challenging. Herein, we report the observation of broad voltage-tunable EL in colloidal type-II InP/ZnS quantum-dot-seeded CdS tetrapod (TP) LEDs. The EL color can be tuned from red to bluish white by varying the red and blue emission intensities from type-II interfaces and arms, respectively. The capacitor device proves that an external electric field can enhance the color tuning in type-II TPs. COMSOL simulations, numerical calculations, and transient absorption measurements are performed to understand the underlying photophysical mechanism. Our results indicate that the reduced hole relaxation rate from the arm to the quantum dot core can enhance the emission from the CdS arms, which is favorable for EL color tuning. This study provides a novel method to realize voltage-tunable EL colors with potential in display and micro-optoelectronic applications.
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Affiliation(s)
- Chenhao Wang
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, People's Republic of China
| | - Jianhui Fu
- Shenzhen Research Institute, The Hong Kong Polytechnic University Shenzhen, Guangdong 518057, People's Republic of China
| | - Qi Wei
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, People's Republic of China
- Shenzhen Research Institute, The Hong Kong Polytechnic University Shenzhen, Guangdong 518057, People's Republic of China
| | - Hui Ren
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, People's Republic of China
| | - Qi Liu
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, People's Republic of China
| | - Luwei Zhou
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, People's Republic of China
| | - Pengzhi Wang
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, People's Republic of China
| | - Mingjie Li
- Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, People's Republic of China
- Shenzhen Research Institute, The Hong Kong Polytechnic University Shenzhen, Guangdong 518057, People's Republic of China
- Photonics Research Institute, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, People's Republic of China
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4
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Li M, Hail CU, Biswas S, Atwater HA. Excitonic Beam Steering in an Active van der Waals Metasurface. NANO LETTERS 2023; 23:2771-2777. [PMID: 36921321 DOI: 10.1021/acs.nanolett.3c00032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Two-dimensional transition metal dichalcogenides (2D TMDCs) are promising candidates for ultrathin active nanophotonic elements due to the strong tunable excitonic resonances that dominate their optical response. Here, we demonstrate dynamic beam steering by an active van der Waals metasurface that leverages large complex refractive index tunability near excitonic resonances in monolayer molybdenum diselenide (MoSe2). Through varying the radiative and nonradiative rates of the excitons, we can dynamically control both the reflection amplitude and phase profiles, resulting in an excitonic phased array metasurface. Our experiments show reflected light steering to angles between -30° and 30° at different resonant wavelengths corresponding to the A exciton and B exciton. This active van der Waals metasurface relies solely on the excitonic resonances of the monolayer MoSe2 material rather than geometric resonances of patterned nanostructures, suggesting the potential to harness the tunability of excitonic resonances for wavefront shaping in emerging photonic applications.
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Affiliation(s)
- Melissa Li
- Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States
| | - Claudio U Hail
- Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States
| | - Souvik Biswas
- Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States
| | - Harry A Atwater
- Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States
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5
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Chung DS, Davidson-Hall T, Cotella G, Lyu Q, Chun P, Aziz H. Significant Lifetime Enhancement in QLEDs by Reducing Interfacial Charge Accumulation via Fluorine Incorporation in the ZnO Electron Transport Layer. NANO-MICRO LETTERS 2022; 14:212. [PMID: 36333462 PMCID: PMC9636368 DOI: 10.1007/s40820-022-00970-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 10/08/2022] [Indexed: 05/22/2023]
Abstract
ZnO nanoparticles are widely used for the electron transport layers (ETLs) of quantum dots light emitting devices (QLEDs). In this work we show that incorporating fluorine (F) into the ZnO ETL results in significant enhancement in device electroluminescence stability, leading to LT50 at 100 cd m-2 of 2,370,000 h in red QLED, 47X longer than the control devices. X-ray photo-electron spectroscopy, time-of-flight secondary ion mass spectroscopy, photoluminescence and electrical measurements show that the F passivates oxygen vacancies and reduces electron traps in ZnO. Transient photoluminescence versus bias measurements and capacitance-voltage-luminance measurements reveal that the CF4 plasma-treated ETLs lead to increased electron concentration in the QD and the QD/hole transport layer interface, subsequently decreasing hole accumulation, and hence the higher stability. The findings provide new insights into the critical roles that optimizing charge distribution across the layers play in influencing stability and present a novel and simple approach for extending QLED lifetimes.
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Affiliation(s)
- Dong Seob Chung
- Department of Electrical and Computer Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada.
| | - Tyler Davidson-Hall
- Department of Electrical and Computer Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada
| | - Giovanni Cotella
- Ipswich Research Centre, Huawei Technologies Research & Development (UK) Ltd., Phoenix House (B55), Adastral Park, Ipswich, IP5 3RE, UK
| | - Quan Lyu
- Ipswich Research Centre, Huawei Technologies Research & Development (UK) Ltd., Phoenix House (B55), Adastral Park, Ipswich, IP5 3RE, UK
| | - Peter Chun
- Ottawa IC Laboratory, Huawei Canada, 19 Allstate Parkway, Markham, ON, L3R 5B4, Canada
| | - Hany Aziz
- Department of Electrical and Computer Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada.
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6
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Radchanka A, Hrybouskaya V, Iodchik A, Achtstein AW, Artemyev M. Zeta Potential-Based Control of CdSe/ZnS Quantum Dot Photoluminescence. J Phys Chem Lett 2022; 13:4912-4917. [PMID: 35634986 DOI: 10.1021/acs.jpclett.2c00841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The ζ-potential of a colloidal quantum dot (QD) in solution has a strong impact on its photoluminescence emission quantum yield as well as the population lifetime. In this study we show that varying the surface charged groups on CdSe/ZnS QDs allows one to tune the ζ-potential and, with it, to control the quantum yield of emission as well as the recombination dynamics. We infer that the net charge density within the slipping plane around the QD in the solution strongly affects the nonradiative recombination processes, depending on the surface charge sign and value. For zwitterionic surface groups it is possible to tune the ζ-potential and the quantum yield by pH. As a general trend, QDs with zwitterionic surface groups produce a low (absolute) ζ-potential value and exhibit the highest quantum yield. Our results pave the way to, for example, future intracellular, time-resolved pH sensing applications with similar systems.
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Affiliation(s)
- Aliaksandra Radchanka
- Research Institute for Physical Chemical Problems, Belarusian State University, 220006 Minsk, Belarus
| | - Varvara Hrybouskaya
- Research Institute for Physical Chemical Problems, Belarusian State University, 220006 Minsk, Belarus
| | - Andrey Iodchik
- Research Institute for Physical Chemical Problems, Belarusian State University, 220006 Minsk, Belarus
| | - Alexander W Achtstein
- Institute of Optics and Atomic Physics, Technical University of Berlin, 10623 Berlin, Germany
| | - Mikhail Artemyev
- Research Institute for Physical Chemical Problems, Belarusian State University, 220006 Minsk, Belarus
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7
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Fiala T, Mosharov EV, Wang J, Mendieta AM, Choi SJ, Fialova E, Hwu C, Sulzer D, Sames D. Chemical Targeting of Rhodol Voltage-Sensitive Dyes to Dopaminergic Neurons. ACS Chem Neurosci 2022; 13:1251-1262. [PMID: 35400149 DOI: 10.1021/acschemneuro.1c00862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Optical imaging of changes in the membrane potential of living cells can be achieved by means of fluorescent voltage-sensitive dyes (VSDs). A particularly challenging task is to efficiently deliver these highly lipophilic probes to specific neuronal subpopulations in brain tissue. We have tackled this task by designing a solubilizing, hydrophilic polymer platform that carries a high-affinity ligand for a membrane protein marker of interest and a fluorescent VSD. Here, we disclose an improved design of polymer-supported probes for chemical, nongenetic targeting of voltage sensors to axons natively expressing the dopamine transporter in ex vivo mouse brain tissue. We first show that for negatively charged rhodol VSDs functioning on the photoinduced electron transfer principle, poly(ethylene glycol) as a carrier enables targeting with higher selectivity than the polysaccharide dextran in HEK cell culture. In the same experimental setting, we also demonstrate that incorporation of an azetidine ring into the rhodol chromophore substantially increases the brightness and voltage sensitivity of the respective VSD. We show that the superior properties of the optimized sensor are transferable to recording of electrically evoked activity from dopaminergic axons in mouse striatal slices after averaging of multiple trials. Finally, we suggest the next milestones for the field to achieve single-scan recordings with nongenetically targeted VSDs in native brain tissue.
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Affiliation(s)
- Tomas Fiala
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Eugene V. Mosharov
- Department of Neurology, Columbia University Irving Medical Center, New York, New York 10032, United States
| | - Jihang Wang
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Adriana M. Mendieta
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Se Joon Choi
- Department of Psychiatry, Columbia University Irving Medical Center, New York, New York 10032, United States
| | - Eva Fialova
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - Christopher Hwu
- Department of Chemistry, Columbia University, New York, New York 10027, United States
| | - David Sulzer
- Department of Neurology, Columbia University Irving Medical Center, New York, New York 10032, United States
- Department of Psychiatry, Columbia University Irving Medical Center, New York, New York 10032, United States
- Department of Pharmacology, Columbia University Irving Medical Center, New York, New York 10032, United States
- Department of Molecular Therapeutics, New York State Psychiatric Institute, New York, New York 10032, United States
| | - Dalibor Sames
- Department of Chemistry, Columbia University, New York, New York 10027, United States
- NeuroTechnology Center at Columbia University, New York, New York 10027, United States
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8
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Ortiz G, Liu P, Deal PE, Nensel AK, Martinez KN, Shamardani K, Adesnik H, Miller EW. A silicon-rhodamine chemical-genetic hybrid for far red voltage imaging from defined neurons in brain slice. RSC Chem Biol 2021; 2:1594-1599. [PMID: 34977574 PMCID: PMC8637932 DOI: 10.1039/d1cb00156f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Accepted: 09/27/2021] [Indexed: 02/06/2023] Open
Abstract
We describe the design, synthesis, and application of voltage-sensitive silicon rhodamines. Based on the Berkeley Red Sensor of Transmembrane potential, or BeRST, scaffold, the new dyes possess an isomeric molecular wire for improved alignment in the plasma membrane and 2′ carboxylic acids for ready functionalization. The new isoBeRST dyes have a voltage sensitivity of 24% ΔF/F per 100 mV. Combined with a flexible polyethyleneglycol (PEG) linker and a chloroalkane HaloTag ligand, isoBeRST dyes enable voltage imaging from genetically defined cells and neurons and provide improved labeling over previous, rhodamine-based hybrid strategies. isoBeRST-Halo hybrid indicators achieve single-trial voltage imaging of membrane potential dynamics from cultured hippocampal neurons or cortical neurons in brain slices. With far-red/near infrared excitation and emission, turn-on response to action potentials, and effective cell labeling in thick tissue, the new isoBeRST-Halo derivatives provide an important complement to voltage imaging in neurobiology. Small-molecule enzyme hybrids pair a far-red voltage-sensitive fluorophore with a cell-surface expressed HaloTag enzyme via a flexible linker to enable voltage imaging from genetically defined neurons in culture and brain slice.![]()
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Affiliation(s)
- Gloria Ortiz
- Department of Chemistry, University of California Berkeley California 94720-1460 USA
| | - Pei Liu
- Department of Chemistry, University of California Berkeley California 94720-1460 USA
| | - Parker E Deal
- Department of Chemistry, University of California Berkeley California 94720-1460 USA
| | - Ashley K Nensel
- Department of Chemistry, University of California Berkeley California 94720-1460 USA
| | - Kayli N Martinez
- Department of Chemistry, University of California Berkeley California 94720-1460 USA
| | - Kiarash Shamardani
- Department of Molecular & Cell Biology, University of California Berkeley California 94720-1460 USA
| | - Hillel Adesnik
- Department of Molecular & Cell Biology, University of California Berkeley California 94720-1460 USA.,Helen Wills Neuroscience Institute, University of California Berkeley California 94720-1460 USA
| | - Evan W Miller
- Department of Chemistry, University of California Berkeley California 94720-1460 USA .,Department of Molecular & Cell Biology, University of California Berkeley California 94720-1460 USA.,Helen Wills Neuroscience Institute, University of California Berkeley California 94720-1460 USA
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9
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Zeng Q, Li X, Zhang S, Deng C, Wu T. Think big, see small—A review of nanomaterials for neural interfaces. NANO SELECT 2021. [DOI: 10.1002/nano.202100256] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Qi Zeng
- Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen P.R. China
- College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen P.R. China
| | - Xiaojian Li
- Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen P.R. China
- Key Laboratory of Brain Connectome and Manipulation Chinese Academy of Sciences Shenzhen‐Hong Kong Institute of Brain Science‐Shenzhen Fundamental Research Institutions Shenzhen P.R. China
| | - Shiyun Zhang
- Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen P.R. China
| | - Chunshan Deng
- Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen P.R. China
- Key Laboratory of Brain Connectome and Manipulation Chinese Academy of Sciences Shenzhen‐Hong Kong Institute of Brain Science‐Shenzhen Fundamental Research Institutions Shenzhen P.R. China
| | - Tianzhun Wu
- Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen P.R. China
- Key Laboratory of Health Bioinformatics Chinese Academy of Sciences Shenzhen P.R. China
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10
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Porotnikov D, Harankahage D, Ellison C, Yang M, Cassidy J, Zamkov M. Photoinduced Rotation of Colloidal Semiconductor Nanocrystals in an Electric Field. NANO LETTERS 2021; 21:4787-4794. [PMID: 34038138 DOI: 10.1021/acs.nanolett.1c01327] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We demonstrate that solution-phase semiconductor nanocrystals (NCs) undergo photoinduced rotation in an external electric field. Present measurements backed by theoretical calculations show that the rotation of colloidal NCs is driven by the excited-state dipole moment, which is counterbalanced by the solvent viscosity drag. Corresponding angular velocities range from 0.5°/ns for cubic CsPbBr3 NCs to 3°/ns for nanoparticles with a large photoinduced charge separation (CdSe/CdS core-shell and dot-in-a-rod NCs). Because of photoinduced rotation, solution-phase semiconductor NCs exhibited an order-of-magnitude increase in the spectral changes caused by the quantum confined Stark effect (QCSE), compared to solid NC assemblies. The enhanced QCSE of colloidal NCs reflected their global alignment in solution, which could be retained in a solid environment by slow crystallization. Overall, we expect that the demonstrated phenomenon of the colloidal nanocrystal rotation in an electric field will open up new avenues for developing electro-optical and voltage-sensitive applications.
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Affiliation(s)
- Dmitry Porotnikov
- The Center for Photochemical Sciences and Department of Physics, Bowling Green State University, Bowling Green, Ohio 43403, United States
| | - Dulanjan Harankahage
- The Center for Photochemical Sciences and Department of Physics, Bowling Green State University, Bowling Green, Ohio 43403, United States
| | - Cole Ellison
- The Center for Photochemical Sciences and Department of Physics, Bowling Green State University, Bowling Green, Ohio 43403, United States
| | - Mingrui Yang
- The Center for Photochemical Sciences and Department of Physics, Bowling Green State University, Bowling Green, Ohio 43403, United States
| | - James Cassidy
- The Center for Photochemical Sciences and Department of Physics, Bowling Green State University, Bowling Green, Ohio 43403, United States
| | - Mikhail Zamkov
- The Center for Photochemical Sciences and Department of Physics, Bowling Green State University, Bowling Green, Ohio 43403, United States
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11
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Yu Q, Wang X, Nie L. Optical recording of brain functions based on voltage-sensitive dyes. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2020.12.060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Yu H, Ying W, Li G, Lin X, Jiang D, Chen G, Chen S, Sun X, Xu Y, Ye J, Zhuo C. Exploring concomitant neuroimaging and genetic alterations in patients with and patients without auditory verbal hallucinations: A pilot study and mini review. J Int Med Res 2021; 48:300060519884856. [PMID: 32696690 PMCID: PMC7376300 DOI: 10.1177/0300060519884856] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Objective To explore concomitant neuroimaging and genetic alterations in patients with
schizophrenia with or without auditory verbal hallucinations (AVHs), and to
discuss the use of pattern recognition techniques in the development of an
objective index that may improve diagnostic accuracy and treatment outcomes
for schizophrenia. Methods The pilot study included patients with schizophrenia with AVHs (SCH-AVH
group) and without AVHs (SCH-no AVH group). High throughput sequencing (HTS)
was performed to explore RNA networks. Global functional connectivity
density (gFCD) analysis was performed to assess functional connectivity (FC)
alterations of the default mode network (DMN). Quantitative long noncoding
(lnc) RNA and mRNA expression data were related to peak T values of gFCDs
using Pearson’s correlation coefficient analysis. Results Compared with the SCH-no AVH group (n = 5), patients in the
SCH-AVH group (n = 5) exhibited differences in RNA
expression in RNA networks that were related to AVH severity, and displayed
alterations in FC (reflected by gFCD differences) within the DMN (posterior
cingulate and dorsal-medial prefrontal cortex), and in the right parietal
lobe, left occipital lobe, and left temporal lobe. Peak lncRNA expression
values were significantly related to peak gFCD T values within the DMN. Conclusion Among patients with schizophrenia, there are concomitant FC and genetic
expression alterations associated with AVHs. Data from pattern recognition
studies may inform the development of an objective index aimed at improving
early diagnostic accuracy and treatment planning for patients with
schizophrenia with and without AVHs.
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Affiliation(s)
- Haiping Yu
- Department of Psychiatric-Neuro-Imaging-Genetics Laboratory, Wenzhou Seventh People's Hospital, Wenzhou, Zhejiang, China
| | - Wang Ying
- Psychiatric Neuroimaging-Genetic and Comorbidity Laboratory, Tianjin Mental Health Centre, Tianjin Anding Hospital, Tianjin, China
| | - Gang Li
- Department of Psychiatry, Tianshui Third Hospital, Gansu, China
| | - Xiaodong Lin
- Department of Psychiatric-Neuro-Imaging-Genetics Laboratory, Wenzhou Seventh People's Hospital, Wenzhou, Zhejiang, China
| | - Deguo Jiang
- Department of Psychiatric-Neuro-Imaging-Genetics Laboratory, Wenzhou Seventh People's Hospital, Wenzhou, Zhejiang, China
| | - Guangdong Chen
- Department of Psychiatric-Neuro-Imaging-Genetics Laboratory, Wenzhou Seventh People's Hospital, Wenzhou, Zhejiang, China
| | - Suling Chen
- Department of Psychiatric-Neuro-Imaging-Genetics Laboratory, Wenzhou Seventh People's Hospital, Wenzhou, Zhejiang, China
| | - Xiuhai Sun
- Department of Neurology, Zoucheng People's Hospital, Jining Medical University Affiliated Zoucheng Hospital, Shandong, China
| | - Yong Xu
- Department of Psychiatry, The First Hospital of Shanxi Medical University, Shanxi, China
| | - Jiaen Ye
- Department of Psychiatric-Neuro-Imaging-Genetics Laboratory, Wenzhou Seventh People's Hospital, Wenzhou, Zhejiang, China
| | - Chuanjun Zhuo
- Department of Psychiatric-Neuro-Imaging-Genetics Laboratory, Wenzhou Seventh People's Hospital, Wenzhou, Zhejiang, China.,Psychiatric Neuroimaging-Genetic and Comorbidity Laboratory, Tianjin Mental Health Centre, Tianjin Anding Hospital, Tianjin, China.,Department of Psychiatry, Tianjin Fourth Centre Hospital, Tianjin, China.,Department of Psychiatric-Neuro-Imaging-Genetics Laboratory, School of Mental Health of Jining Medical University, Jining, Shandong, China
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13
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Lv B, Zhu T, Tang Y, Lv Y, Zhang C, Wang X, Shu D, Xiao M. Probing Permanent Dipole Moments and Removing Exciton Fine Structures in Single Perovskite Nanocrystals by an Electric Field. PHYSICAL REVIEW LETTERS 2021; 126:197403. [PMID: 34047589 DOI: 10.1103/physrevlett.126.197403] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 09/27/2020] [Accepted: 04/08/2021] [Indexed: 05/16/2023]
Abstract
Single perovskite nanocrystals have emerged as a novel type of semiconductor nanostructure capable of emitting single photons with rich exciton species and fine energy-level structures. Here we focus on single excitons and biexcitons in single perovskite CsPbI_{3} nanocrystals to show, for the first time, how their optical properties are modulated by an external electric field at the cryogenic temperature. The electric field can cause a blueshift in the photoluminescence peak of single excitons, from which the existence of a permanent dipole moment can be deduced. Meanwhile, the fine energy-level structures of single excitons and biexcitons in a single CsPbI_{3} nanocrystal can be simultaneously eliminated, thus preparing a potent platform for the potential generation of polarization-entangled photon pairs.
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Affiliation(s)
- Bihu Lv
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Tianyuan Zhu
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Ying Tang
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Yan Lv
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Chunfeng Zhang
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Xiaoyong Wang
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Dajun Shu
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
| | - Min Xiao
- National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
- Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, USA
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14
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Xiao J, Liu Y, Steinmetz V, Çaǧlar M, Mc Hugh J, Baikie T, Gauriot N, Nguyen M, Ruggeri E, Andaji-Garmaroudi Z, Stranks SD, Legrand L, Barisien T, Friend RH, Greenham NC, Rao A, Pandya R. Optical and Electronic Properties of Colloidal CdSe Quantum Rings. ACS NANO 2020; 14:14740-14760. [PMID: 33044058 DOI: 10.1021/acsnano.0c01752] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Luminescent colloidal CdSe nanorings are a recently developed type of semiconductor structure that have attracted interest due to the potential for rich physics arising from their nontrivial toroidal shape. However, the exciton properties and dynamics of these materials with complex topology are not yet well understood. Here, we use a combination of femtosecond vibrational spectroscopy, temperature-resolved photoluminescence (PL), and single-particle measurements to study these materials. We find that on transformation of CdSe nanoplatelets to nanorings, by perforating the center of platelets, the emission lifetime decreases and the emission spectrum broadens due to ensemble variations in the ring size and thickness. The reduced PL quantum yield of nanorings (∼10%) compared to platelets (∼30%) is attributed to an enhanced coupling between (i) excitons and CdSe LO-phonons at 200 cm-1 and (ii) negatively charged selenium-rich traps, which give nanorings a high surface charge (∼-50 mV). Population of these weakly emissive trap sites dominates the emission properties with an increased trap emission at low temperatures relative to excitonic emission. Our results provide a detailed picture of the nature of excitons in nanorings and the influence of phonons and surface charge in explaining the broad shape of the PL spectrum and the origin of PL quantum yield losses. Furthermore, they suggest that the excitonic properties of nanorings are not solely a consequence of the toroidal shape but also a result of traps introduced by puncturing the platelet center.
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Affiliation(s)
- James Xiao
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Yun Liu
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Violette Steinmetz
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Mustafa Çaǧlar
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Jeffrey Mc Hugh
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Tomi Baikie
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Nicolas Gauriot
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Malgorzata Nguyen
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Edoardo Ruggeri
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Zahra Andaji-Garmaroudi
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
- Department of Chemical Engineering & Biotechnology, University of Cambridge, Philippa Fawcett Drive, CB3 0AS, Cambridge, United Kingdom
| | - Samuel D Stranks
- Sorbonne Université, CNRS-UMR 7588, Institut des NanoSciences de Paris, INSP, 4 Place Jussieu, F-75005 Paris, France
| | - Laurent Legrand
- Sorbonne Université, CNRS-UMR 7588, Institut des NanoSciences de Paris, INSP, 4 Place Jussieu, F-75005 Paris, France
| | - Thierry Barisien
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Richard H Friend
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Neil C Greenham
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
| | - Akshay Rao
- Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, CB3 0HE, Cambridge, United Kingdom
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15
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Huang X, Tang M. Research advance on cell imaging and cytotoxicity of different types of quantum Dots. J Appl Toxicol 2020; 41:342-361. [DOI: 10.1002/jat.4083] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 08/30/2020] [Accepted: 09/10/2020] [Indexed: 01/19/2023]
Affiliation(s)
- Xiaoquan Huang
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health Southeast University Nanjing P.R. China
| | - Meng Tang
- Key Laboratory of Environmental Medicine and Engineering, Ministry of Education; School of Public Health Southeast University Nanjing P.R. China
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16
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Nag OK, Muroski ME, Hastman DA, Almeida B, Medintz IL, Huston AL, Delehanty JB. Nanoparticle-Mediated Visualization and Control of Cellular Membrane Potential: Strategies, Progress, and Remaining Issues. ACS NANO 2020; 14:2659-2677. [PMID: 32078291 DOI: 10.1021/acsnano.9b10163] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The interfacing of nanoparticle (NP) materials with cells, tissues, and organisms for a range of applications including imaging, sensing, and drug delivery continues at a rampant pace. An emerging theme in this area is the use of NPs and nanostructured surfaces for the imaging and/or control of cellular membrane potential (MP). Given the important role that MP plays in cellular biology, both in normal physiology and in disease, new materials and methods are continually being developed to probe the activity of electrically excitable cells such as neurons and muscle cells. In this Review, we highlight the current state of the art for both the visualization and control of MP using traditional materials and techniques, discuss the advantageous features of NPs for performing these functions, and present recent examples from the literature of how NP materials have been implemented for the visualization and control of the activity of electrically excitable cells. We conclude with a forward-looking perspective of how we expect to see this field progress in the near term and further into the future.
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Affiliation(s)
- Okhil K Nag
- Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, DC 20375, United States
| | - Megan E Muroski
- Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, DC 20375, United States
- American Society for Engineering Education, Washington, D.C. 20036, United States
| | - David A Hastman
- Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, DC 20375, United States
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Bethany Almeida
- Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, DC 20375, United States
- American Society for Engineering Education, Washington, D.C. 20036, United States
| | - Igor L Medintz
- Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, DC 20375, United States
| | - Alan L Huston
- Division of Optical Sciences, Code 5600, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States
| | - James B Delehanty
- Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory, Washington, DC 20375, United States
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17
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Semiconductor quantum dot FRET: Untangling energy transfer mechanisms in bioanalytical assays. Trends Analyt Chem 2020. [DOI: 10.1016/j.trac.2019.115750] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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18
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Caglar M, Pandya R, Xiao J, Foster SK, Divitini G, Chen RYS, Greenham NC, Franze K, Rao A, Keyser UF. All-Optical Detection of Neuronal Membrane Depolarization in Live Cells Using Colloidal Quantum Dots. NANO LETTERS 2019; 19:8539-8549. [PMID: 31686516 PMCID: PMC7007274 DOI: 10.1021/acs.nanolett.9b03026] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 11/05/2019] [Indexed: 05/30/2023]
Abstract
Luminescent semiconductor quantum dots (QDs) have recently been suggested as novel probes for imaging and sensing cell membrane voltages. However, a key bottleneck for their development is a lack of techniques to assess QD responses to voltages generated in the aqueous electrolytic environments typical of biological systems. Even more generally, there have been relatively few efforts to assess the response of QDs to voltage changes in live cells. Here, we develop a platform for monitoring the photoluminescence (PL) response of QDs under AC and DC voltage changes within aqueous ionic environments. We evaluate both traditional CdSe/CdS and more biologically compatible InP/ZnS QDs at a range of ion concentrations to establish their PL/voltage characteristics on chip. Wide-field, few-particle PL measurements with neuronal cells show the QDs can be used to track local voltage changes with greater sensitivity (ΔPL up to twice as large) than state-of-the-art calcium imaging dyes, making them particularly appealing for tracking subthreshold events. Additional physiological observation studies showed that while CdSe/CdS dots have greater PL responses on membrane depolarization, their lower cytotoxicity makes InP/ZnS far more suitable for voltage sensing in living systems. Our results provide a methodology for the rational development of QD voltage sensors and highlight their potential for imaging changes in cell membrane voltage.
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Affiliation(s)
- Mustafa Caglar
- Department
of Physics, Cavendish Laboratory, University
of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Raj Pandya
- Department
of Physics, Cavendish Laboratory, University
of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - James Xiao
- Department
of Physics, Cavendish Laboratory, University
of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Sarah K. Foster
- Department
of Physiology, Development, and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3DY, United Kingdom
| | - Giorgio Divitini
- Department
of Materials Science and Metallurgy, University
of Cambridge, Cambridge CB3 0FS, United Kingdom
| | - Richard Y. S. Chen
- Department
of Physics, Cavendish Laboratory, University
of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Neil C. Greenham
- Department
of Physics, Cavendish Laboratory, University
of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Kristian Franze
- Department
of Physiology, Development, and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3DY, United Kingdom
| | - Akshay Rao
- Department
of Physics, Cavendish Laboratory, University
of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
| | - Ulrich F. Keyser
- Department
of Physics, Cavendish Laboratory, University
of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
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19
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Grupi A, Ashur I, Degani-Katzav N, Yudovich S, Shapira Z, Marzouq A, Morgenstein L, Mandel Y, Weiss S. Interfacing the Cell with "Biomimetic Membrane Proteins". SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1903006. [PMID: 31765076 DOI: 10.1002/smll.201903006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 09/30/2019] [Indexed: 06/10/2023]
Abstract
Integral membrane proteins mediate a myriad of cellular processes and are the target of many therapeutic drugs. Enhancement and extension of the functional scope of membrane proteins can be realized by membrane incorporation of engineered nanoparticles designed for specific diagnostic and therapeutic applications. In contrast to hydrophobic insertion of small amphiphilic molecules, delivery and membrane incorporation of particles on the nanometric scale poses a crucial barrier for technological development. In this perspective, the transformative potential of biomimetic membrane proteins (BMPs), current state of the art, and the barriers that need to be overcome in order to advance the field are discussed.
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Affiliation(s)
- Asaf Grupi
- Department of Physics, Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
- Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Idan Ashur
- Agricultural Research Organization, The Volcani Center, Institute of Agricultural Engineering, Rishon LeZion, 7505101, Israel
| | - Nurit Degani-Katzav
- Department of Physics, Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
- Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Shimon Yudovich
- Department of Physics, Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
- Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Zehavit Shapira
- Department of Physics, Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
- Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Adan Marzouq
- Department of Physics, Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
- Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Lion Morgenstein
- Department of Physics, Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
- Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Yossi Mandel
- Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
- School of Optometry and Vision Science, Faculty of Life Sciences, Bar-Ilan University, Ramat-Gan, 5290002, Israel
| | - Shimon Weiss
- Department of Physics, Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
- Institute for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan, 5290002, Israel
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, CA, 90095, USA
- California NanoSystems Institute, University of California Los Angeles, Los Angeles, CA, 90095, USA
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20
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Yu J, Shendre S, Koh WK, Liu B, Li M, Hou S, Hettiarachchi C, Delikanli S, Hernández-Martínez P, Birowosuto MD, Wang H, Sum T, Demir HV, Dang C. Electrically control amplified spontaneous emission in colloidal quantum dots. SCIENCE ADVANCES 2019; 5:eaav3140. [PMID: 31692653 PMCID: PMC6814376 DOI: 10.1126/sciadv.aav3140] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 09/14/2019] [Indexed: 05/29/2023]
Abstract
Colloidal quantum dots (CQDs) are highly promising materials for light amplification thanks to their efficient photoluminescence, tunable emission wavelength and low-cost synthesis. Unfortunately, CQDs are suffering from band-edge state degeneracy which demands multiple excitons to achieve population inversion. As a result, non-radiative Auger recombination increases the lasing threshold and limits the gain lifetime. Here, benefiting from the negative charging, we demonstrate that the amplified spontaneous emission (ASE) threshold is controllable in a device where CQD film is exposed to an external electric field. Specifically, singly charged CQDs lower the threshold due to the preexisting electron in the conduction band, while strongly enhanced Auger recombination in doubly charged CQDs stymies the ASE. Experimental results and kinetic equation model show that ASE threshold reduces 10% even if our device only charges ~17% of the CQD population. Our results open new possibilities for controlling exciton recombination dynamics and achieving electrically pumped CQD lasers.
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Affiliation(s)
- Junhong Yu
- LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore
| | - Sushant Shendre
- LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore
| | - Weon-kyu Koh
- LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore
| | - Baiquan Liu
- LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore
| | - Mingjie Li
- School of Physical and Mathematical Sciences, Nanyang Technological University, 639798 Singapore, Singapore
| | - Songyan Hou
- CINTRA UMI CNRS/NTU/THALES 3288, Research Techno Plaza, 50 Nanyang Drive, Border X Block, Level 6, 637553 Singapore, Singapore
| | - Chathuranga Hettiarachchi
- Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering & The Photonics Institute, Nanyang Technological University, 639798 Singapore, Singapore
| | - Savas Delikanli
- LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore
| | - Pedro Hernández-Martínez
- LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore
| | - Muhammad Danang Birowosuto
- CINTRA UMI CNRS/NTU/THALES 3288, Research Techno Plaza, 50 Nanyang Drive, Border X Block, Level 6, 637553 Singapore, Singapore
| | - Hong Wang
- CINTRA UMI CNRS/NTU/THALES 3288, Research Techno Plaza, 50 Nanyang Drive, Border X Block, Level 6, 637553 Singapore, Singapore
- Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering & The Photonics Institute, Nanyang Technological University, 639798 Singapore, Singapore
| | - TzeChien Sum
- School of Physical and Mathematical Sciences, Nanyang Technological University, 639798 Singapore, Singapore
| | - Hilmi Volkan Demir
- LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore
- School of Physical and Mathematical Sciences, Nanyang Technological University, 639798 Singapore, Singapore
- Department of Electrical and Electronics Engineering and Department of Physics, UNAM–Institute of Materials Science and Nanotechnology, Bilkent University, Bilkent, Ankara, 06800, Turkey
| | - Cuong Dang
- LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore
- CINTRA UMI CNRS/NTU/THALES 3288, Research Techno Plaza, 50 Nanyang Drive, Border X Block, Level 6, 637553 Singapore, Singapore
- Centre for OptoElectronics and Biophotonics, School of Electrical and Electronic Engineering & The Photonics Institute, Nanyang Technological University, 639798 Singapore, Singapore
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21
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Sardoiwala MN, Srivastava AK, Karmakar S, Roy Choudhury S. Nanostructure Endows Neurotherapeutic Potential in Optogenetics: Current Development and Future Prospects. ACS Chem Neurosci 2019; 10:3375-3385. [PMID: 31244053 DOI: 10.1021/acschemneuro.9b00246] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Optogenetics have evolved as a promising tool to control the processes at a cellular level via photons. Specially, it confers a specific control over cellular function through real-time cytomodulation even in freely moving animals. Neuronal stimulation is prerequisite for deep tissue light penetration or insertion of optrode for light illumination to the neurons that have been proven to be compromised due to poor light penetration and invasiveness of the procedure, respectively. In this review, the application of nanotechnology is being elaborated by the use of metal nanoparticles (AuNPs), upconversion nanocrystals (UCNPs), and quantum dots (CdSe) for targeting particular organs or tissues, and their potential to emit a specific light on excitation to overcome the limitations associated with earlier methods has been elucidated. The optothermal and magnetothermal properties, photoluminescence, and higher photostability of nanomaterials are explored in context of therapeutic applicability of optogenetics. The nanostructure characteristics and specific ion channel targeting have shown promising therapeutic potential against neurodegenerative disorders (Alzheimer's, Parkinson's, Huntington's), epilepsy, and blindness. This review compiles mechanical and optical characteristics of nanomaterials that endow superior optogenetic therapeutic potentials to cure immedicable infirmities.
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Affiliation(s)
| | - Anup K. Srivastava
- Institute of Nano Science and Technology, Habitat Centre, Phase-10, Mohali, Punjab 160062, India
| | - Surajit Karmakar
- Institute of Nano Science and Technology, Habitat Centre, Phase-10, Mohali, Punjab 160062, India
| | - Subhasree Roy Choudhury
- Institute of Nano Science and Technology, Habitat Centre, Phase-10, Mohali, Punjab 160062, India
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22
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Confined Growth of Quantum Dots in Silica Spheres by Ion Exchange of “Trapped NH4+” for White-Light Emission. Chem 2019. [DOI: 10.1016/j.chempr.2019.06.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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23
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Park J, Kuo Y, Li J, Huang YL, Miller EW, Weiss S. Improved Surface Functionalization and Characterization of Membrane-Targeted Semiconductor Voltage Nanosensors. J Phys Chem Lett 2019; 10:3906-3913. [PMID: 31241960 DOI: 10.1021/acs.jpclett.9b01258] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Type-II ZnSe/CdS voltage-sensing seeded nanorods (vsNRs) were functionalized with α-helical peptides and zwitterionic-decorated lipoic acids (zw-LAs). Specific membrane targeting with high loading efficiency and minimal nonspecific binding was achieved. These vsNRs display quantum yield (QY) modulation as a function of membrane potential (MP) changes, as demonstrated at the ensemble level for (i) vesicles treated with valinomycin and (ii) wild-type HEK cells under alternating buffers with different [K+]. ΔF/F of ∼ 1% was achieved.
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Affiliation(s)
- Joonhyuck Park
- Department of Chemistry and Biochemistry , University of California Los Angeles , Los Angeles , California 90095 , United States
| | - Yung Kuo
- Department of Chemistry and Biochemistry , University of California Los Angeles , Los Angeles , California 90095 , United States
| | - Jack Li
- Department of Chemistry and Biochemistry , University of California Los Angeles , Los Angeles , California 90095 , United States
| | - Yi-Lin Huang
- Department of Chemistry , Department Molecular & Cell Biology , and Helen Wills Neuroscience Institute , University of California Berkeley , Berkeley , California 94720 , United States
| | - Evan W Miller
- Department of Chemistry , Department Molecular & Cell Biology , and Helen Wills Neuroscience Institute , University of California Berkeley , Berkeley , California 94720 , United States
| | - Shimon Weiss
- Department of Chemistry and Biochemistry , University of California Los Angeles , Los Angeles , California 90095 , United States
- California NanoSystems Institute , University of California Los Angeles , Los Angeles , California 90095 , United States
- Department of Physiology , University of California Los Angeles , Los Angeles , California 90095 , United States
- Department of Physics, Institute for Nanotechnology and Advanced Materials , Bar-Ilan University , Ramat-Gan 52900 , Israel
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24
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Mehrotra P, Chatterjee B, Sen S. EM-Wave Biosensors: A Review of RF, Microwave, mm-Wave and Optical Sensing. SENSORS (BASEL, SWITZERLAND) 2019; 19:E1013. [PMID: 30818865 PMCID: PMC6427747 DOI: 10.3390/s19051013] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2018] [Revised: 02/20/2019] [Accepted: 02/21/2019] [Indexed: 12/12/2022]
Abstract
This article presents a broad review on optical, radio-frequency (RF), microwave (MW), millimeter wave (mmW) and terahertz (THz) biosensors. Biomatter-wave interaction modalities are considered over a wide range of frequencies and applications such as detection of cancer biomarkers, biotin, neurotransmitters and heart rate are presented in detail. By treating biological tissue as a dielectric substance, having a unique dielectric signature, it can be characterized by frequency dependent parameters such as permittivity and conductivity. By observing the unique permittivity spectrum, cancerous cells can be distinguished from healthy ones or by measuring the changes in permittivity, concentration of medically relevant biomolecules such as glucose, neurotransmitters, vitamins and proteins, ailments and abnormalities can be detected. In case of optical biosensors, any change in permittivity is transduced to a change in optical properties such as photoluminescence, interference pattern, reflection intensity and reflection angle through techniques like quantum dots, interferometry, surface enhanced raman scattering or surface plasmon resonance. Conversely, in case of RF, MW, mmW and THz biosensors, capacitive sensing is most commonly employed where changes in permittivity are reflected as changes in capacitance, through components like interdigitated electrodes, resonators and microstrip structures. In this paper, interactions of EM waves with biomatter are considered, with an emphasis on a clear demarcation of various modalities, their underlying principles and applications.
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Affiliation(s)
| | | | - Shreyas Sen
- ECE, Purdue University, West Lafayette, IN 47906, USA.
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Baimuratov AS, Pereziabova TP, Tepliakov NV, Leonov MY, Baranov AV, Fedorov AV, Rukhlenko ID. Electric-field-enhanced circular dichroism of helical semiconductor nanoribbons. OPTICS LETTERS 2019; 44:499-502. [PMID: 30702663 DOI: 10.1364/ol.44.000499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2018] [Accepted: 12/20/2018] [Indexed: 06/09/2023]
Abstract
In this Letter, we analyze circular dichroism (CD) enhancement of a helical semiconductor nanoribbon exposed to a weak homogenous electric field. By creating a periodic superlattice for the confined electrons, the electric field splits the electronic sub-bands into minibands and gives rise to critical points in the electronic density of states. We show that the modification of the electronic energy spectrum results in the appearance of new optically active transitions in the CD and absorption spectra, and that the CD signal of the nanoribbon is significantly enhanced at the critical points. The ability to dynamically control the chiroptical response of semiconductor nanoribbons by an external electric field makes them promising for the next-generation nanophotonic devices.
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Del Bonis-O’Donnell JT, Chio L, Dorlhiac GF, McFarlane IR, Landry MP. Advances in Nanomaterials for Brain Microscopy. NANO RESEARCH 2018; 11:5144-5172. [PMID: 31105899 PMCID: PMC6516768 DOI: 10.1007/s12274-018-2145-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 07/05/2018] [Accepted: 07/08/2018] [Indexed: 05/19/2023]
Abstract
Microscopic imaging of the brain continues to reveal details of its structure, connectivity, and function. To further improve our understanding of the emergent properties and functions of neural circuits, new methods are necessary to directly visualize the relationship between brain structure, neuron activity, and neurochemistry. Advances in engineering the chemical and optical properties of nanomaterials concurrent with developments in deep-tissue microscopy hold tremendous promise for overcoming the current challenges associated with in vivo brain imaging, particularly for imaging the brain through optically-dense brain tissue, skull, and scalp. To this end, developments in nanomaterials offer much promise toward implementing tunable chemical functionality for neurochemical targeting and sensing, and fluorescence stability for long-term imaging. In this review, we summarize current brain microscopy methods and describe the diverse classes of nanomaterials recently leveraged as contrast agents and functional probes for microscopic optical imaging of the brain.
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Affiliation(s)
| | - Linda Chio
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720
| | - Gabriel F Dorlhiac
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720
| | - Ian R McFarlane
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720
| | - Markita P Landry
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720
- Innovative Genomics Institute (IGI), Berkeley, CA 94720
- California Institute for Quantitative Biosciences, QB3, University of California, Berkeley, CA 94720
- Chan-Zuckerberg Biohub, San Francisco, CA 94158
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Bar-Elli O, Steinitz D, Yang G, Tenne R, Ludwig A, Kuo Y, Triller A, Weiss S, Oron D. Rapid Voltage Sensing with Single Nanorods via the Quantum Confined Stark Effect. ACS PHOTONICS 2018; 5:2860-2867. [PMID: 30042952 PMCID: PMC6053642 DOI: 10.1021/acsphotonics.8b00206] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Indexed: 05/05/2023]
Abstract
Properly designed colloidal semiconductor quantum dots (QDs) have already been shown to exhibit high sensitivity to external electric fields via the quantum confined Stark effect (QCSE). Yet, detection of the characteristic spectral shifts associated with the effect of the QCSE has traditionally been painstakingly slow, dramatically limiting the sensitivity of these QD sensors to fast transients. We experimentally demonstrate a new detection scheme designed to achieve shot-noise-limited sensitivity to emission wavelength shifts in QDs, showing feasibility for their use as local electric field sensors on the millisecond time scale. This regime of operation is already potentially suitable for detection of single action potentials in neurons at a high spatial resolution.
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Affiliation(s)
- Omri Bar-Elli
- Department of Physics
of Complex Systems, Weizmann Institute of
Science, Rehovot 76100, Israel
| | - Dan Steinitz
- Department of Physics
of Complex Systems, Weizmann Institute of
Science, Rehovot 76100, Israel
| | - Gaoling Yang
- Department of Physics
of Complex Systems, Weizmann Institute of
Science, Rehovot 76100, Israel
| | - Ron Tenne
- Department of Physics
of Complex Systems, Weizmann Institute of
Science, Rehovot 76100, Israel
| | - Anastasia Ludwig
- L’Ecole
Normale Superieure, Institute of Biologie
(IBENS), Paris Sciences et Lettres (PSL), CNRS UMR 8197, Inserm 1024, 46 Rue d’Ulm, Paris 75005, France
| | - Yung Kuo
- Department of Chemistry and Biochemistry, Department of Physiology,
and California NanoSystems Institute, University
of California Los Angeles, Los
Angeles, California 90095, United States
| | - Antoine Triller
- L’Ecole
Normale Superieure, Institute of Biologie
(IBENS), Paris Sciences et Lettres (PSL), CNRS UMR 8197, Inserm 1024, 46 Rue d’Ulm, Paris 75005, France
| | - Shimon Weiss
- Department of Chemistry and Biochemistry, Department of Physiology,
and California NanoSystems Institute, University
of California Los Angeles, Los
Angeles, California 90095, United States
- Department of Physics, Institute for Nanotechnology
and Advanced Materials, Bar-Ilan University, Ramat-Gan 52900, Israel
| | - Dan Oron
- Department of Physics
of Complex Systems, Weizmann Institute of
Science, Rehovot 76100, Israel
- E-mail:
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Di Maria F, Lodola F, Zucchetti E, Benfenati F, Lanzani G. The evolution of artificial light actuators in living systems: from planar to nanostructured interfaces. Chem Soc Rev 2018; 47:4757-4780. [PMID: 29663003 DOI: 10.1039/c7cs00860k] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Artificially enhancing light sensitivity in living cells allows control of neuronal paths or vital functions avoiding the wiring associated with the use of stimulation electrodes. Many possible strategies can be adopted for reaching this goal, including the direct photoexcitation of biological matter, the genetic modification of cells or the use of opto-bio interfaces. In this review we describe different light actuators based on both inorganic and organic semiconductors, from planar abiotic/biotic interfaces to nanoparticles, that allow transduction of a light signal into a signal which in turn affects the biological activity of the hosting system. In particular, we will focus on the application of thiophene-based materials which, thanks to their unique chemical-physical properties, geometrical adaptability, great biocompatibility and stability, have allowed the development of a new generation of fully organic light actuators for in vivo applications.
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Kennehan ER, Doucette GS, Marshall AR, Grieco C, Munson KT, Beard MC, Asbury JB. Electron-Phonon Coupling and Resonant Relaxation from 1D and 1P States in PbS Quantum Dots. ACS NANO 2018; 12:6263-6272. [PMID: 29792675 DOI: 10.1021/acsnano.8b03216] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Observations of the hot-phonon bottleneck, which is predicted to slow the rate of hot carrier cooling in quantum confined nanocrystals, have been limited to date for reasons that are not fully understood. We used time-resolved infrared spectroscopy to directly measure higher energy intraband transitions in PbS colloidal quantum dots. Direct measurements of these intraband transitions permitted detailed analysis of the electronic overlap of the quantum confined states that may influence their relaxation processes. In smaller PbS nanocrystals, where the hot-phonon bottleneck is expected to be most pronounced, we found that relaxation of parity selection rules combined with stronger electron-phonon coupling led to greater spectral overlap of transitions among the quantum confined states. This created pathways for fast energy transfer and relaxation that may bypass the predicted hot-phonon bottleneck. In contrast, larger, but still quantum confined nanocrystals did not exhibit such relaxation of the parity selection rules and possessed narrower intraband states. These observations were consistent with slower relaxation dynamics that have been measured in larger quantum confined systems. These findings indicated that, at small radii, electron-phonon interactions overcome the advantageous increase in energetic separation of the electronic states for PbS quantum dots. Selection of appropriately sized quantum dots, which minimize spectral broadening due to electron-phonon interactions while maximizing electronic state separation, is necessary to observe the hot-phonon bottleneck. Such optimization may provide a framework for achieving efficient hot carrier collection and multiple exciton generation.
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Affiliation(s)
| | | | - Ashley R Marshall
- Chemical and Materials Science , National Renewable Energy Laboratory (NREL) , Golden , Colorado 80401 , United States
- Department of Chemistry and Biochemistry , University of Colorado , Boulder , Colorado 80309 , United States
| | | | | | - Matthew C Beard
- Chemical and Materials Science , National Renewable Energy Laboratory (NREL) , Golden , Colorado 80401 , United States
- Department of Chemistry and Biochemistry , University of Colorado , Boulder , Colorado 80309 , United States
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Efros AL, Delehanty JB, Huston AL, Medintz IL, Barbic M, Harris TD. Evaluating the potential of using quantum dots for monitoring electrical signals in neurons. NATURE NANOTECHNOLOGY 2018; 13:278-288. [PMID: 29636589 DOI: 10.1038/s41565-018-0107-1] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2017] [Accepted: 02/26/2018] [Indexed: 06/08/2023]
Abstract
Success in the projects aimed at providing an advanced understanding of the brain is directly predicated on making critical advances in nanotechnology. This Perspective addresses the unique interface of neuroscience and nanomaterials by considering the foundational problem of sensing neuron membrane voltage and offers a potential solution that may be facilitated by a prototypical nanomaterial. Despite substantial improvements, the visualization of instantaneous voltage changes within individual neurons, whether in cell culture or in vivo, at both the single-cell and network level at high speed remains complex and problematic. The unique properties of semiconductor quantum dots (QDs) have made them powerful fluorophores for bioimaging. What is not widely appreciated, however, is that QD photoluminescence is exquisitely sensitive to proximal electric fields. This property should be suitable for sensing voltage changes that occur in the active neuronal membrane. Here, we examine the potential role of QDs in addressing the important challenge of real-time optical voltage imaging.
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Affiliation(s)
- Alexander L Efros
- Center for Computational Materials Science (6390), US Naval Research Laboratory, Washington, DC, USA.
| | - James B Delehanty
- Center for Bio/Molecular Science and Engineering (6900), US Naval Research Laboratory, Washington, DC, USA
| | - Alan L Huston
- Optical Sciences Division (5611), US Naval Research Laboratory, Washington, DC, USA
| | - Igor L Medintz
- Center for Bio/Molecular Science and Engineering (6900), US Naval Research Laboratory, Washington, DC, USA
| | - Mladen Barbic
- Applied Physics and Instrumentation Group, Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA, USA
| | - Timothy D Harris
- Applied Physics and Instrumentation Group, Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA, USA.
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Young AT, Cornwell N, Daniele MA. Neuro-Nano Interfaces: Utilizing Nano-Coatings and Nanoparticles to Enable Next-Generation Electrophysiological Recording, Neural Stimulation, and Biochemical Modulation. ADVANCED FUNCTIONAL MATERIALS 2018; 28:1700239. [PMID: 33867903 PMCID: PMC8049593 DOI: 10.1002/adfm.201700239] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Neural interfaces provide a window into the workings of the nervous system-enabling both biosignal recording and modulation. Traditionally, neural interfaces have been restricted to implanted electrodes to record or modulate electrical activity of the nervous system. Although these electrode systems are both mechanically and operationally robust, they have limited utility due to the resultant macroscale damage from invasive implantation. For this reason, novel nanomaterials are being investigated to enable new strategies to chronically interact with the nervous system at both the cellular and network level. In this feature article, the use of nanomaterials to improve current electrophysiological interfaces, as well as enable new nano-interfaces to modulate neural activity via alternative mechanisms, such as remote transduction of electromagnetic fields are explored. Specifically, this article will review the current use of nanoparticle coatings to enhance electrode function, then an analysis of the cutting-edge, targeted nanoparticle technologies being utilized to interface with both the electrophysiological and biochemical behavior of the nervous system will be provided. Furthermore, an emerging, specialized-use case for neural interfaces will be presented: the modulation of the blood-brain barrier.
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Affiliation(s)
- Ashlyn T Young
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill, and North Carolina State University, 911 Oval Dr., Raleigh, NC 27695, USA
| | - Neil Cornwell
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill, and North Carolina State University, 911 Oval Dr., Raleigh, NC 27695, USA
| | - Michael A Daniele
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill, and North Carolina State University, 911 Oval Dr., Raleigh, NC 27695, USA
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Dynamically controlled Purcell enhancement of visible spontaneous emission in a gated plasmonic heterostructure. Nat Commun 2017; 8:1631. [PMID: 29158507 PMCID: PMC5696373 DOI: 10.1038/s41467-017-01870-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 10/20/2017] [Indexed: 12/02/2022] Open
Abstract
Emission control of colloidal quantum dots (QDs) is a cornerstone of modern high-quality lighting and display technologies. Dynamic emission control of colloidal QDs in an optoelectronic device is usually achieved by changing the optical pump intensity or injection current density. Here we propose and demonstrate a distinctly different mechanism for the temporal modulation of QD emission intensity at constant optical pumping rate. Our mechanism is based on the electrically controlled modulation of the local density of optical states (LDOS) at the position of the QDs, resulting in the modulation of the QD spontaneous emission rate, far-field emission intensity, and quantum yield. We manipulate the LDOS via field effect-induced optical permittivity modulation of an ultrathin titanium nitride (TiN) film, which is incorporated in a gated TiN/SiO2/Ag plasmonic heterostructure. The demonstrated electrical control of the colloidal QD emission provides a new approach for modulating intensity of light in displays and other optoelectronics. The dynamic control of light emission from quantum dots is generally controlled via optical or electrical pumping. Here, Lu et al. electrically control the local density of states around a quantum dot to modulate its visible light emission properties.
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34
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See GG, Gao A, Xu L, Nuzzo R, Gong S, Cunningham BT. Quantum dot emission modulation using piezoelectric photonic crystal MEMS resonators. OPTICS EXPRESS 2017; 25:25831-25841. [PMID: 29041246 DOI: 10.1364/oe.25.025831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 10/02/2017] [Indexed: 06/07/2023]
Abstract
Quantum dots (QDs) integration into photonic devices requires varied approaches to control and modulate their emission. We demonstrate voltage-tunable PC structures with integrated QDs over suspended piezoelectric aluminum nitride thin film resonators that modulate PC enhancement at MHz frequencies. When the piezoelectric device is actuated at its resonant mechanical frequency, the extracted QD emission direction is likewise modulated via the optical resonant frequency of the PC. Modulation uses nanometer-scale mechanical displacements, offering the potential for greater switching speed and improved mechanical robustness that is not subject to the effects of stiction with a scalable fabrication approach.
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35
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Park K, Weiss S. Design Rules for Membrane-Embedded Voltage-Sensing Nanoparticles. Biophys J 2017; 112:703-713. [PMID: 28256230 PMCID: PMC5340176 DOI: 10.1016/j.bpj.2016.12.047] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 12/15/2016] [Accepted: 12/28/2016] [Indexed: 11/20/2022] Open
Abstract
Voltage-sensing dyes and voltage-sensing fluorescence proteins have been continually improved and as a result have provided a wealth of insights into neuronal circuits. Further improvements in voltage-sensing dyes and voltage-sensing fluorescence proteins are needed, however, for routine detection of single action potentials across a large number of individual neurons in a large field-of-view of a live mammalian brain. On the other hand, recent experiments and calculations suggest that semiconducting nanoparticles could act as efficient voltage sensors, suitable for the above-mentioned task. This study presents quantum mechanical calculations, including Auger recombination rates, of the quantum-confined Stark effect in membrane-embedded semiconducting nanoparticles, examines their possible utility as membrane voltage sensors, and provide design rules for their structure and composition.
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Affiliation(s)
- Kyoungwon Park
- Department of Electrical Engineering, University of California Los Angeles, Los Angeles, California
| | - Shimon Weiss
- Department of Chemistry and Biochemistry, University of California Los Angeles, Los Angeles, California; Department of Physiology, University of California Los Angeles, Los Angeles, California; California NanoSystems Institute, University of California Los Angeles, Los Angeles, California.
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Nag OK, Stewart MH, Deschamps JR, Susumu K, Oh E, Tsytsarev V, Tang Q, Efros AL, Vaxenburg R, Black BJ, Chen Y, O’Shaughnessy TJ, North SH, Field LD, Dawson PE, Pancrazio JJ, Medintz IL, Chen Y, Erzurumlu RS, Huston AL, Delehanty JB. Quantum Dot-Peptide-Fullerene Bioconjugates for Visualization of in Vitro and in Vivo Cellular Membrane Potential. ACS NANO 2017; 11:5598-5613. [PMID: 28514167 PMCID: PMC6001310 DOI: 10.1021/acsnano.7b00954] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We report the development of a quantum dot (QD)-peptide-fullerene (C60) electron transfer (ET)-based nanobioconjugate for the visualization of membrane potential in living cells. The bioconjugate is composed of (1) a central QD electron donor, (2) a membrane-inserting peptidyl linker, and (3) a C60 electron acceptor. The photoexcited QD donor engages in ET with the C60 acceptor, resulting in quenching of QD photoluminescence (PL) that tracks positively with the number of C60 moieties arrayed around the QD. The nature of the QD-capping ligand also modulates the quenching efficiency; a neutral ligand coating facilitates greater QD quenching than a negatively charged carboxylated ligand. Steady-state photophysical characterization confirms an ET-driven process between the donor-acceptor pair. When introduced to cells, the amphiphilic QD-peptide-C60 bioconjugate labels the plasma membrane by insertion of the peptide-C60 portion into the hydrophobic bilayer, while the hydrophilic QD sits on the exofacial side of the membrane. Depolarization of cellular membrane potential augments the ET process, which is manifested as further quenching of QD PL. We demonstrate in HeLa cells, PC12 cells, and primary cortical neurons significant QD PL quenching (ΔF/F0 of 2-20% depending on the QD-C60 separation distance) in response to membrane depolarization with KCl. Further, we show the ability to use the QD-peptide-C60 probe in combination with conventional voltage-sensitive dyes (VSDs) for simultaneous two-channel imaging of membrane potential. In in vivo imaging of cortical electrical stimulation, the optical response of the optimal QD-peptide-C60 configuration exhibits temporal responsivity to electrical stimulation similar to that of VSDs. Notably, however, the QD-peptide-C60 construct displays 20- to 40-fold greater ΔF/F0 than VSDs. The tractable nature of the QD-peptide-C60 system offers the advantages of ease of assembly, large ΔF/F0, enhanced photostability, and high throughput without the need for complicated organic synthesis or genetic engineering, respectively, that is required of traditional VSDs and fluorescent protein constructs.
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Affiliation(s)
- Okhil K. Nag
- Center for Bio/Molecular Science and Engineering, Code 6900
| | | | | | - Kimihiro Susumu
- Optical Sciences Division, Code 5600
- Sotera Defense Solutions, Columbia, Maryland 21046, United States
| | - Eunkeu Oh
- Optical Sciences Division, Code 5600
- Sotera Defense Solutions, Columbia, Maryland 21046, United States
| | - Vassiliy Tsytsarev
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
- Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland 21201, United States
| | - Qinggong Tang
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Alexander L. Efros
- Materials and Science and Technology Division, Code 6300, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States
| | - Roman Vaxenburg
- Computational Materials Science Center, George Mason University, Fairfax, Virginia 22030, United States
| | - Bryan J. Black
- Department of Bioengineering, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - YungChia Chen
- Center for Bio/Molecular Science and Engineering, Code 6900
| | - Thomas J. O’Shaughnessy
- Materials and Science and Technology Division, Code 6300, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States
| | | | - Lauren D. Field
- Center for Bio/Molecular Science and Engineering, Code 6900
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Philip E. Dawson
- Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037, United States
| | - Joseph J. Pancrazio
- Department of Bioengineering, University of Texas at Dallas, Richardson, Texas 75080, United States
| | | | - Yu Chen
- Fischell Department of Bioengineering, University of Maryland, College Park, Maryland 20742, United States
| | - Reha S. Erzurumlu
- Department of Anatomy and Neurobiology, University of Maryland School of Medicine, Baltimore, Maryland 21201, United States
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Rivnay J, Wang H, Fenno L, Deisseroth K, Malliaras GG. Next-generation probes, particles, and proteins for neural interfacing. SCIENCE ADVANCES 2017; 3:e1601649. [PMID: 28630894 PMCID: PMC5466371 DOI: 10.1126/sciadv.1601649] [Citation(s) in RCA: 224] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 04/18/2017] [Indexed: 05/18/2023]
Abstract
Bidirectional interfacing with the nervous system enables neuroscience research, diagnosis, and therapy. This two-way communication allows us to monitor the state of the brain and its composite networks and cells as well as to influence them to treat disease or repair/restore sensory or motor function. To provide the most stable and effective interface, the tools of the trade must bridge the soft, ion-rich, and evolving nature of neural tissue with the largely rigid, static realm of microelectronics and medical instruments that allow for readout, analysis, and/or control. In this Review, we describe how the understanding of neural signaling and material-tissue interactions has fueled the expansion of the available tool set. New probe architectures and materials, nanoparticles, dyes, and designer genetically encoded proteins push the limits of recording and stimulation lifetime, localization, and specificity, blurring the boundary between living tissue and engineered tools. Understanding these approaches, their modality, and the role of cross-disciplinary development will support new neurotherapies and prostheses and provide neuroscientists and neurologists with unprecedented access to the brain.
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Affiliation(s)
- Jonathan Rivnay
- Department of Biomedical Engineering, Northwestern University, Evanston, IL 60208, USA
- Palo Alto Research Center, Palo Alto, CA 94304, USA
- Corresponding author.
| | - Huiliang Wang
- Departments of Bioengineering and Psychiatry, Stanford University, Stanford, CA 94305, USA
| | - Lief Fenno
- Departments of Bioengineering and Psychiatry, Stanford University, Stanford, CA 94305, USA
| | - Karl Deisseroth
- Departments of Bioengineering and Psychiatry, Stanford University, Stanford, CA 94305, USA
| | - George G. Malliaras
- Department of Bioelectronics, École Nationale Supérieure des Mines, CMP-EMSE, MOC, Gardanne 13541, France
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Dai X, Deng Y, Peng X, Jin Y. Quantum-Dot Light-Emitting Diodes for Large-Area Displays: Towards the Dawn of Commercialization. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1607022. [PMID: 28256780 DOI: 10.1002/adma.201607022] [Citation(s) in RCA: 256] [Impact Index Per Article: 36.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Revised: 02/02/2017] [Indexed: 05/21/2023]
Abstract
Quantum dots are a unique class of emitters with size-tunable emission wavelengths, saturated emission colors, near-unity luminance efficiency, inherent photo- and thermal- stability and excellent solution processability. Quantum dots have been used as down-converters for back-lighting in liquid-crystal displays to improve color gamut, leading to the booming of quantum-dot televisions in consumer market. In the past few years, efficiency and lifetime of electroluminescence devices based on quantum dots achieved tremendous progress. These encouraging facts foreshadow the commercialization of quantum-dot light-emitting diodes (QLEDs), which promises an unprecedented generation of cost-effective, large-area, energy-saving, wide-color-gamut, ultra-thin and flexible displays. Here we provide a Progress Report, covering interdisciplinary aspects including material chemistry of quantum dots and charge-transporting layers, optimization and mechanism studies of prototype devices and processing techniques to produce large-area and high-resolution red-green-blue pixel arrays. We also identify a few key challenges facing the development of active-matrix QLED displays.
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Affiliation(s)
- Xingliang Dai
- Center for Chemistry of High-Performance & Novel Materials, State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People's Republic of China
| | - Yunzhou Deng
- Center for Chemistry of High-Performance & Novel Materials, State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, People's Republic of China
| | - Xiaogang Peng
- Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, People's Republic of China
| | - Yizheng Jin
- Center for Chemistry of High-Performance & Novel Materials, State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, People's Republic of China
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Chen R, Canales A, Anikeeva P. Neural Recording and Modulation Technologies. NATURE REVIEWS. MATERIALS 2017; 2:16093. [PMID: 31448131 PMCID: PMC6707077 DOI: 10.1038/natrevmats.2016.93] [Citation(s) in RCA: 289] [Impact Index Per Article: 41.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Within the mammalian nervous system, billions of neurons connected by quadrillions of synapses exchange electrical, chemical and mechanical signals. Disruptions to this network manifest as neurological or psychiatric conditions. Despite decades of neuroscience research, our ability to treat or even to understand these conditions is limited by the tools capable of probing the signalling complexity of the nervous system. Although orders of magnitude smaller and computationally faster than neurons, conventional substrate-bound electronics do not address the chemical and mechanical properties of neural tissue. This mismatch results in a foreign-body response and the encapsulation of devices by glial scars, suggesting that the design of an interface between the nervous system and a synthetic sensor requires additional materials innovation. Advances in genetic tools for manipulating neural activity have fuelled the demand for devices capable of simultaneous recording and controlling individual neurons at unprecedented scales. Recently, flexible organic electronics and bio- and nanomaterials have been developed for multifunctional and minimally invasive probes for long-term interaction with the nervous system. In this Review, we discuss the design lessons from the quarter-century-old field of neural engineering, highlight recent materials-driven progress in neural probes, and look at emergent directions inspired by the principles of neural transduction.
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Affiliation(s)
- Ritchie Chen
- Department of Materials Science and Engineering, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Andres Canales
- Department of Materials Science and Engineering, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Polina Anikeeva
- Department of Materials Science and Engineering, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, USA
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40
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Hildebrandt N, Spillmann CM, Algar WR, Pons T, Stewart MH, Oh E, Susumu K, Díaz SA, Delehanty JB, Medintz IL. Energy Transfer with Semiconductor Quantum Dot Bioconjugates: A Versatile Platform for Biosensing, Energy Harvesting, and Other Developing Applications. Chem Rev 2016; 117:536-711. [DOI: 10.1021/acs.chemrev.6b00030] [Citation(s) in RCA: 457] [Impact Index Per Article: 57.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Niko Hildebrandt
- NanoBioPhotonics
Institut d’Electronique Fondamentale (I2BC), Université Paris-Saclay, Université Paris-Sud, CNRS, 91400 Orsay, France
| | | | - W. Russ Algar
- Department
of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Thomas Pons
- LPEM;
ESPCI Paris, PSL Research University; CNRS; Sorbonne Universités, UPMC, F-75005 Paris, France
| | | | - Eunkeu Oh
- Sotera Defense Solutions, Inc., Columbia, Maryland 21046, United States
| | - Kimihiro Susumu
- Sotera Defense Solutions, Inc., Columbia, Maryland 21046, United States
| | - Sebastian A. Díaz
- American Society for Engineering Education, Washington, DC 20036, United States
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41
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Dennis AM, Delehanty JB, Medintz IL. Emerging Physicochemical Phenomena along with New Opportunities at the Biomolecular-Nanoparticle Interface. J Phys Chem Lett 2016; 7:2139-50. [PMID: 27219278 DOI: 10.1021/acs.jpclett.6b00570] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Efforts to create new nanoparticle-biomolecule hybrids for diverse applications including biosensing, theranostics, drug delivery, and even biocomputation continue to grow at an unprecedented rate. As the composite designs become more sophisticated, new and unanticipated physicochemical phenomena are emerging at the nanomaterial-biological interface. These phenomena arise from two interrelated factors, namely, the novel architecture of nanoparticle bioconjugates and the unique physicochemical properties of their interfacial environment. Here we examine how the augmented functionality imparted by such hybrid structures, including accessing concentric energy transfer, enhanced enzymatic activity, and sensitivity to electric fields, is leading to new applications. We discuss some lesser-understood phenomena that arise at the nanoparticle interface, such as the complex and confounding issue of protein corona formation, along with their unexpected benefits. Overall, understanding these complex phenomena will improve the design of composite materials while uncovering new opportunities for their application.
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Affiliation(s)
- Allison M Dennis
- Department of Biomedical Engineering, Boston University , 44 Cummington Mall, Boston, Massachusetts 02215, United States
| | - James B Delehanty
- Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory , 4555 Overlook Avenue, Southwest, Washington, District of Columbia 20375, United States
| | - Igor L Medintz
- Center for Bio/Molecular Science and Engineering, Code 6900, U.S. Naval Research Laboratory , 4555 Overlook Avenue, Southwest, Washington, District of Columbia 20375, United States
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Badreddine AH, Jordan T, Bigio IJ. Real-time imaging of action potentials in nerves using changes in birefringence. BIOMEDICAL OPTICS EXPRESS 2016; 7:1966-73. [PMID: 27231635 PMCID: PMC4871095 DOI: 10.1364/boe.7.001966] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 04/08/2016] [Accepted: 04/19/2016] [Indexed: 05/09/2023]
Abstract
Polarized light can be used to measure the electrical activity associated with action potential propagation in nerves, as manifested in simultaneous dynamic changes in their intrinsic optical birefringence. These signals may serve as a tool for minimally invasive neuroimaging in various types of neuroscience research, including the study of neuronal activation patterns with high spatiotemporal resolution. A fast linear photodiode array was used to image propagating action potentials in an excised portion of the lobster walking leg nerve. We show that the crossed-polarized signal (XPS) can be reliably imaged over a ≥2 cm span in our custom nerve chamber, by averaging multiple-stimulation signals, and also in single-scan real-time "movies". This demonstration paves the way toward utilizing changes in the optical birefringence to image more complex neuronal activity in nerve fibers and other organized neuronal tissue.
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Affiliation(s)
- Ali H. Badreddine
- Department of Biomedical Engineering, Boston University, Boston, MA 02215, USA
| | - Tomas Jordan
- Department of Biomedical Engineering, Boston University, Boston, MA 02215, USA
| | - Irving J. Bigio
- Department of Biomedical Engineering, Boston University, Boston, MA 02215, USA
- Department of Electrical & Computer Engineering, Boston University, Boston, MA 02215, USA
- Boston University Photonics Center, Boston University, Boston, MA 02215, USA
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Nettles CB, Zhou Y, Zou S, Zhang D. UV–Vis Ratiometric Resonance Synchronous Spectroscopy for Determination of Nanoparticle and Molecular Optical Cross Sections. Anal Chem 2016; 88:2891-8. [DOI: 10.1021/acs.analchem.5b04722] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Charles B. Nettles
- Department
of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - Yadong Zhou
- Department
of Chemistry, University of Central Florida, Orlando, Florida 32816, United States
| | - Shengli Zou
- Department
of Chemistry, University of Central Florida, Orlando, Florida 32816, United States
| | - Dongmao Zhang
- Department
of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
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Abstract
This review elaborates on the possible applications of nanomaterials in optogenetics and analyses the benefits of nanomaterial-mediated optogenetics.
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Affiliation(s)
- Kai Huang
- Department of Biomedical Engineering
- National University of Singapore
- Singapore 117576
- Singapore
| | - Qingqing Dou
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science, Technology and Research)
- Singapore 138634
- Singapore
| | - Xian Jun Loh
- Institute of Materials Research and Engineering
- A*STAR (Agency for Science, Technology and Research)
- Singapore 138634
- Singapore
- Department of Materials Science and Engineering
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