1
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Flores-Diaz N, De Rossi F, Das A, Deepa M, Brunetti F, Freitag M. Progress of Photocapacitors. Chem Rev 2023; 123:9327-9355. [PMID: 37294781 PMCID: PMC10416220 DOI: 10.1021/acs.chemrev.2c00773] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Indexed: 06/11/2023]
Abstract
In response to the current trend of miniaturization of electronic devices and sensors, the complementary coupling of high-efficiency energy conversion and low-loss energy storage technologies has given rise to the development of photocapacitors (PCs), which combine energy conversion and storage in a single device. Photovoltaic systems integrated with supercapacitors offer unique light conversion and storage capabilities, resulting in improved overall efficiency over the past decade. Consequently, researchers have explored a wide range of device combinations, materials, and characterization techniques. This review provides a comprehensive overview of photocapacitors, including their configurations, operating mechanisms, manufacturing techniques, and materials, with a focus on emerging applications in small wireless devices, Internet of Things (IoT), and Internet of Everything (IoE). Furthermore, we highlight the importance of cutting-edge materials such as metal-organic frameworks (MOFs) and organic materials for supercapacitors, as well as novel materials in photovoltaics, in advancing PCs for a carbon-free, sustainable society. We also evaluate the potential development, prospects, and application scenarios of this emerging area of research.
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Affiliation(s)
- Natalie Flores-Diaz
- School
of Natural and Environmental Science, Bedson Building, Newcastle University, NE1 7RU Newcastle upon Tyne, United Kingdom
| | - Francesca De Rossi
- CHOSE
(Centre for Hybrid and Organic Solar Energy), Department of Electronic
Engineering, University of Rome “Tor
Vergata”, via
del Politecnico 1, 00133 Rome, Italy
| | - Aparajita Das
- Department
of Chemistry, Indian Institute of Technology
Hyderabad, Kandi, 502285 Sangareddy, Telangana, India
| | - Melepurath Deepa
- Department
of Chemistry, Indian Institute of Technology
Hyderabad, Kandi, 502285 Sangareddy, Telangana, India
| | - Francesca Brunetti
- CHOSE
(Centre for Hybrid and Organic Solar Energy), Department of Electronic
Engineering, University of Rome “Tor
Vergata”, via
del Politecnico 1, 00133 Rome, Italy
| | - Marina Freitag
- School
of Natural and Environmental Science, Bedson Building, Newcastle University, NE1 7RU Newcastle upon Tyne, United Kingdom
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2
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Karatum O, Han M, Erdogan ET, Karamursel S, Nizamoglu S. Physical mechanisms of emerging neuromodulation modalities. J Neural Eng 2023; 20:031001. [PMID: 37224804 DOI: 10.1088/1741-2552/acd870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Accepted: 05/24/2023] [Indexed: 05/26/2023]
Abstract
One of the ultimate goals of neurostimulation field is to design materials, devices and systems that can simultaneously achieve safe, effective and tether-free operation. For that, understanding the working mechanisms and potential applicability of neurostimulation techniques is important to develop noninvasive, enhanced, and multi-modal control of neural activity. Here, we review direct and transduction-based neurostimulation techniques by discussing their interaction mechanisms with neurons via electrical, mechanical, and thermal means. We show how each technique targets modulation of specific ion channels (e.g. voltage-gated, mechanosensitive, heat-sensitive) by exploiting fundamental wave properties (e.g. interference) or engineering nanomaterial-based systems for efficient energy transduction. Overall, our review provides a detailed mechanistic understanding of neurostimulation techniques together with their applications toin vitro, in vivo, and translational studies to guide the researchers toward developing more advanced systems in terms of noninvasiveness, spatiotemporal resolution, and clinical applicability.
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Affiliation(s)
- Onuralp Karatum
- Department of Electrical and Electronics Engineering, Koc University, Istanbul 34450, Turkey
| | - Mertcan Han
- Department of Electrical and Electronics Engineering, Koc University, Istanbul 34450, Turkey
| | - Ezgi Tuna Erdogan
- Department of Physiology, Koc University School of Medicine, Istanbul 34450, Turkey
| | - Sacit Karamursel
- Department of Physiology, Koc University School of Medicine, Istanbul 34450, Turkey
| | - Sedat Nizamoglu
- Department of Electrical and Electronics Engineering, Koc University, Istanbul 34450, Turkey
- Department of Biomedical Science and Engineering, Koc University, Istanbul 34450, Turkey
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3
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Pal SK, Bardhan D, Sen D, Chatterjee H, Ghosh SK. Angle-resolved plasmonic photocapacitance of gold nanorod dimers. NANOSCALE ADVANCES 2023; 5:1943-1955. [PMID: 36998648 PMCID: PMC10044666 DOI: 10.1039/d3na00061c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 02/17/2023] [Indexed: 06/19/2023]
Abstract
The assembly of nanostructures with plausible statistical orientations has provided the opportunity to correlate physical observables to develop a diverse range of niche applications. The dimeric configurations of gold nanorods have been chosen as atypical model systems to correlate optoelectronic with mechanical properties at a number of combinations of angular orientations. Metals are considered as conductors in electronics and reflectors in optics - therefore, metallic particles at the nanoscale exhibit unique optoelectronic characteristics that enable the design of materials to meet the demand of the modern world. Gold nanorods have often been adopted as prototypical anisotropic nanostructures owing to their excellent shape-selective plasmonic tunability in the vis-NIR region. When a pair of metallic nanostructures is sufficiently close to exhibit electromagnetic interaction, the evolution of collective plasmon modes, substantial enhancement of the near-field and strong squeezing of the electromagnetic energy at the interparticle spatial region of the dimeric nanostructures occur. The localised surface plasmon resonance energies of the nanostructured dimers strongly depend on the geometry as well as the relative configurations of the neighbouring particle pairs. Recent advances in the 'tips and tricks' guide have even made it possible to assemble anisotropic nanostructures in a colloidal dispersion. The optoelectronic characteristics of gold nanorod homodimers at different mutual orientations with statistical variation of the angle between 0 and 90° at particular interparticle distances have been elucidated from both theoretical and experimental perspectives. It has been observed that the optoelectronic properties are governed by mechanical aspects of the nanorods at different angular orientations of the dimers. Therefore, we have approached the design of an optoelectronic landscape through the correlation of the plasmonics and photocapacitance through the optical torque of gold nanorod dimers.
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Affiliation(s)
- Sudip Kumar Pal
- Department of Chemistry, Assam University Silchar-788011 India
| | - Dorothy Bardhan
- Department of Chemistry, Assam University Silchar-788011 India
| | - Debarun Sen
- Department of Chemistry, Assam University Silchar-788011 India
| | | | - Sujit Kumar Ghosh
- Physical Chemistry Section, Department of Chemistry, Jadavpur University Kolkata-700032 India +91-33-24572770
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4
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Ahnood A, Chambers A, Gelmi A, Yong KT, Kavehei O. Semiconducting electrodes for neural interfacing: a review. Chem Soc Rev 2023; 52:1491-1518. [PMID: 36734845 DOI: 10.1039/d2cs00830k] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In the past 50 years, the advent of electronic technology to directly interface with neural tissue has transformed the fields of medicine and biology. Devices that restore or even replace impaired bodily functions, such as deep brain stimulators and cochlear implants, have ushered in a new treatment era for previously intractable conditions. Meanwhile, electrodes for recording and stimulating neural activity have allowed researchers to unravel the vast complexities of the human nervous system. Recent advances in semiconducting materials have allowed effective interfaces between electrodes and neuronal tissue through novel devices and structures. Often these are unattainable using conventional metallic electrodes. These have translated into advances in research and treatment. The development of semiconducting materials opens new avenues in neural interfacing. This review considers this emerging class of electrodes and how it can facilitate electrical, optical, and chemical sensing and modulation with high spatial and temporal precision. Semiconducting electrodes have advanced electrically based neural interfacing technologies owing to their unique electrochemical and photo-electrochemical attributes. Key operation modalities, namely sensing and stimulation in electrical, biochemical, and optical domains, are discussed, highlighting their contrast to metallic electrodes from the application and characterization perspective.
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Affiliation(s)
- Arman Ahnood
- School of Engineering, RMIT University, VIC 3000, Australia
| | - Andre Chambers
- School of Physics, University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Amy Gelmi
- School of Science, RMIT University, VIC 3000, Australia
| | - Ken-Tye Yong
- School of Biomedical Engineering, University of Sydney, Sydney, NSW 2006, Australia.,The University of Sydney Nano Institute, Sydney, NSW 2006, Australia.
| | - Omid Kavehei
- School of Biomedical Engineering, University of Sydney, Sydney, NSW 2006, Australia.,The University of Sydney Nano Institute, Sydney, NSW 2006, Australia.
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5
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Karatum O, Kaleli HN, Eren GO, Sahin A, Nizamoglu S. Electrical Stimulation of Neurons with Quantum Dots via Near-Infrared Light. ACS NANO 2022; 16:8233-8243. [PMID: 35499159 PMCID: PMC9134491 DOI: 10.1021/acsnano.2c01989] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 04/27/2022] [Indexed: 06/14/2023]
Abstract
Photovoltaic biointerfaces offer wireless and battery-free bioelectronic medicine via photomodulation of neurons. Near-infrared (NIR) light enables communication with neurons inside the deep tissue and application of high photon flux within the ocular safety limit of light exposure. For that, nonsilicon biointerfaces are highly demanded for thin and flexible operation. Here, we devised a flexible quantum dot (QD)-based photovoltaic biointerface that stimulates cells within the spectral tissue transparency window by using NIR light (λ = 780 nm). Integration of an ultrathin QD layer of 25 nm into a multilayered photovoltaic architecture enables transduction of NIR light to safe capacitive ionic currents that leads to reproducible action potentials on primary hippocampal neurons with high success rates. The biointerfaces exhibit low in vitro toxicity and robust photoelectrical performance under different stability tests. Our findings show that colloidal quantum dots can be used in wireless bioelectronic medicine for brain, heart, and retina.
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Affiliation(s)
- Onuralp Karatum
- Department
of Electrical and Electronics Engineering, Koc University, Istanbul 34450, Turkey
| | - Humeyra Nur Kaleli
- Research
Center for Translational Medicine, Koc University, Istanbul 34450, Turkey
| | - Guncem Ozgun Eren
- Department
of Biomedical Science and Engineering, Koc
University, Istanbul 34450, Turkey
| | - Afsun Sahin
- Research
Center for Translational Medicine, Koc University, Istanbul 34450, Turkey
- Department
of Ophthalmology, Medical School, Koc University, Istanbul 34450, Turkey
| | - Sedat Nizamoglu
- Department
of Electrical and Electronics Engineering, Koc University, Istanbul 34450, Turkey
- Department
of Biomedical Science and Engineering, Koc
University, Istanbul 34450, Turkey
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6
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Han M, Karatum O, Nizamoglu S. Optoelectronic Neural Interfaces Based on Quantum Dots. ACS APPLIED MATERIALS & INTERFACES 2022; 14:20468-20490. [PMID: 35482955 PMCID: PMC9100496 DOI: 10.1021/acsami.1c25009] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 04/15/2022] [Indexed: 05/26/2023]
Abstract
Optoelectronic modulation of neural activity is an emerging field for the investigation of neural circuits and the development of neural therapeutics. Among a wide variety of nanomaterials, colloidal quantum dots provide unique optoelectronic features for neural interfaces such as sensitive tuning of electron and hole energy levels via the quantum confinement effect, controlling the carrier localization via band alignment, and engineering the surface by shell growth and ligand engineering. Even though colloidal quantum dots have been frontier nanomaterials for solar energy harvesting and lighting, their application to optoelectronic neural interfaces has remained below their significant potential. However, this potential has recently gained attention with the rise of bioelectronic medicine. In this review, we unravel the fundamentals of quantum-dot-based optoelectronic biointerfaces and discuss their neuromodulation mechanisms starting from the quantum dot level up to electrode-electrolyte interactions and stimulation of neurons with their physiological pathways. We conclude the review by proposing new strategies and possible perspectives toward nanodevices for the optoelectronic stimulation of neural tissue by utilizing the exceptional nanoscale properties of colloidal quantum dots.
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Affiliation(s)
- Mertcan Han
- Department
of Electrical and Electronics Engineering, Koç University, Istanbul 34450, Turkey
| | - Onuralp Karatum
- Department
of Electrical and Electronics Engineering, Koç University, Istanbul 34450, Turkey
| | - Sedat Nizamoglu
- Department
of Electrical and Electronics Engineering, Koç University, Istanbul 34450, Turkey
- Graduate
School of Biomedical Science and Engineering, Koç University, Istanbul 34450, Turkey
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7
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Bruno G, Melle G, Barbaglia A, Iachetta G, Melikov R, Perrone M, Dipalo M, De Angelis F. All-Optical and Label-Free Stimulation of Action Potentials in Neurons and Cardiomyocytes by Plasmonic Porous Metamaterials. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2100627. [PMID: 34486241 PMCID: PMC8564419 DOI: 10.1002/advs.202100627] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 06/20/2021] [Indexed: 05/19/2023]
Abstract
Optical stimulation technologies are gaining great consideration in cardiology, neuroscience studies, and drug discovery pathways by providing control over cell activity with high spatio-temporal resolution. However, this high precision requires manipulation of biological processes at genetic level concealing its development from broad scale application. Therefore, translating these technologies into tools for medical or pharmacological applications remains a challenge. Here, an all-optical nongenetic method for the modulation of electrogenic cells is introduced. It is demonstrated that plasmonic metamaterials can be used to elicit action potentials by converting near infrared laser pulses into stimulatory currents. The suggested approach allows for the stimulation of cardiomyocytes and neurons directly on commercial complementary metal-oxide semiconductor microelectrode arrays coupled with ultrafast pulsed laser, providing both stimulation and network-level recordings on the same device.
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Affiliation(s)
- Giulia Bruno
- Plasmon NanotechnologiesIstituto Italiano di TecnologiaGenova16163Italy
| | - Giovanni Melle
- Plasmon NanotechnologiesIstituto Italiano di TecnologiaGenova16163Italy
| | - Andrea Barbaglia
- Plasmon NanotechnologiesIstituto Italiano di TecnologiaGenova16163Italy
| | | | | | - Michela Perrone
- Plasmon NanotechnologiesIstituto Italiano di TecnologiaGenova16163Italy
| | - Michele Dipalo
- Plasmon NanotechnologiesIstituto Italiano di TecnologiaGenova16163Italy
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8
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Karatum O, Aria MM, Eren GO, Yildiz E, Melikov R, Srivastava SB, Surme S, Dogru IB, Bahmani Jalali H, Ulgut B, Sahin A, Kavakli IH, Nizamoglu S. Nanoengineering InP Quantum Dot-Based Photoactive Biointerfaces for Optical Control of Neurons. Front Neurosci 2021; 15:652608. [PMID: 34248476 PMCID: PMC8260855 DOI: 10.3389/fnins.2021.652608] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Accepted: 05/21/2021] [Indexed: 11/15/2022] Open
Abstract
Light-activated biointerfaces provide a non-genetic route for effective control of neural activity. InP quantum dots (QDs) have a high potential for such biomedical applications due to their uniquely tunable electronic properties, photostability, toxic-heavy-metal-free content, heterostructuring, and solution-processing ability. However, the effect of QD nanostructure and biointerface architecture on the photoelectrical cellular interfacing remained unexplored. Here, we unravel the control of the photoelectrical response of InP QD-based biointerfaces via nanoengineering from QD to device-level. At QD level, thin ZnS shell growth (∼0.65 nm) enhances the current level of biointerfaces over an order of magnitude with respect to only InP core QDs. At device-level, band alignment engineering allows for the bidirectional photoelectrochemical current generation, which enables light-induced temporally precise and rapidly reversible action potential generation and hyperpolarization on primary hippocampal neurons. Our findings show that nanoengineering QD-based biointerfaces hold great promise for next-generation neurostimulation devices.
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Affiliation(s)
- Onuralp Karatum
- Department of Electrical and Electronics Engineering, Koc University, Istanbul, Turkey
| | | | - Guncem Ozgun Eren
- Department of Biomedical Science and Engineering, Koc University, Istanbul, Turkey
| | - Erdost Yildiz
- Research Center for Translational Medicine, Koc University, Istanbul, Turkey
| | - Rustamzhon Melikov
- Department of Electrical and Electronics Engineering, Koc University, Istanbul, Turkey
| | | | - Saliha Surme
- Department of Molecular Biology and Genetics, Koc University, Istanbul, Turkey
| | - Itir Bakis Dogru
- Department of Biomedical Science and Engineering, Koc University, Istanbul, Turkey
| | | | - Burak Ulgut
- Department of Chemistry, Bilkent University, Ankara, Turkey
| | - Afsun Sahin
- Research Center for Translational Medicine, Koc University, Istanbul, Turkey
- Department of Ophthalmology, Medical School, Koc University, Istanbul, Turkey
| | | | - Sedat Nizamoglu
- Department of Electrical and Electronics Engineering, Koc University, Istanbul, Turkey
- Department of Biomedical Science and Engineering, Koc University, Istanbul, Turkey
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9
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Karatum O, Eren GO, Melikov R, Onal A, Ow-Yang CW, Sahin M, Nizamoglu S. Quantum dot and electron acceptor nano-heterojunction for photo-induced capacitive charge-transfer. Sci Rep 2021; 11:2460. [PMID: 33510322 PMCID: PMC7843732 DOI: 10.1038/s41598-021-82081-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 01/12/2021] [Indexed: 02/07/2023] Open
Abstract
Capacitive charge transfer at the electrode/electrolyte interface is a biocompatible mechanism for the stimulation of neurons. Although quantum dots showed their potential for photostimulation device architectures, dominant photoelectrochemical charge transfer combined with heavy-metal content in such architectures hinders their safe use. In this study, we demonstrate heavy-metal-free quantum dot-based nano-heterojunction devices that generate capacitive photoresponse. For that, we formed a novel form of nano-heterojunctions using type-II InP/ZnO/ZnS core/shell/shell quantum dot as the donor and a fullerene derivative of PCBM as the electron acceptor. The reduced electron–hole wavefunction overlap of 0.52 due to type-II band alignment of the quantum dot and the passivation of the trap states indicated by the high photoluminescence quantum yield of 70% led to the domination of photoinduced capacitive charge transfer at an optimum donor–acceptor ratio. This study paves the way toward safe and efficient nanoengineered quantum dot-based next-generation photostimulation devices.
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Affiliation(s)
- Onuralp Karatum
- Department of Electrical and Electronics Engineering, Koc University, Istanbul, Turkey
| | - Guncem Ozgun Eren
- Department of Biomedical Sciences and Engineering, Koc University, Istanbul, Turkey
| | - Rustamzhon Melikov
- Department of Electrical and Electronics Engineering, Koc University, Istanbul, Turkey
| | - Asim Onal
- Graduate School of Materials Science and Engineering, Koc University, Istanbul, Turkey
| | - Cleva W Ow-Yang
- Materials Science and Nano-Engineering Program, Sabanci University, Istanbul, Turkey.,Nanotechnology Research and Application Center, Sabanci University, Istanbul, Turkey
| | - Mehmet Sahin
- Department of Nanotechnology Engineering, Abdullah Gul University, Kayseri, Turkey
| | - Sedat Nizamoglu
- Department of Electrical and Electronics Engineering, Koc University, Istanbul, Turkey. .,Department of Biomedical Sciences and Engineering, Koc University, Istanbul, Turkey. .,Graduate School of Materials Science and Engineering, Koc University, Istanbul, Turkey.
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10
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Sadeghi S, Melikov R, Sahin M, Nizamoglu S. Cation exchange mediated synthesis of bright Au@ZnTe core-shell nanocrystals. NANOTECHNOLOGY 2021; 32:025603. [PMID: 33063692 DOI: 10.1088/1361-6528/abbb02] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The synthesis of heterostructured core-shell nanocrystals has attracted significant attention due to their wide range of applications in energy, medicine and environment. To further extend the possible nanostructures, non-epitaxial growth is introduced to form heterostructures with large lattice mismatches, which cannot be achieved by classical epitaxial growth techniques. Here, we report the synthetic procedure of Au@ZnTe core-shell nanostructures by cation exchange reaction for the first time. For that, bimetallic Au@Ag heterostructures were synthesized by using PDDA as stabilizer and shape-controller. Then, by addition of Te and Zn precursors in a step-wise reaction, the zinc and silver cation exchange was performed and Au@ZnTe nanocrystals were obtained. Structural and optical characterization confirmed the formation of the Au@ZnTe nanocrystals. The optimization of the synthesis led to the bright nanocrystals with a photoluminescence quantum yield up to 27%. The non-toxic, versatile synthetic route, and bright emission of the synthesized Au@ZnTe nanocrystals offer significant potential for future bio-imaging and optoelectronic applications.
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Affiliation(s)
- Sadra Sadeghi
- Graduate School of Materials Science and Engineering, Koç University, Istanbul 34450, Turkey
| | - Rustamzhon Melikov
- Department of Electrical and Electronics Engineering, Koç University, Istanbul 34450, Turkey
| | - Mehmet Sahin
- Department of Materials Science and Nanotechnology Engineering, Abdullah Gul University, Kayseri 38080, Turkey
| | - Sedat Nizamoglu
- Graduate School of Materials Science and Engineering, Koç University, Istanbul 34450, Turkey
- Department of Electrical and Electronics Engineering, Koç University, Istanbul 34450, Turkey
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11
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Han M, Srivastava SB, Yildiz E, Melikov R, Surme S, Dogru-Yuksel IB, Kavakli IH, Sahin A, Nizamoglu S. Organic Photovoltaic Pseudocapacitors for Neurostimulation. ACS APPLIED MATERIALS & INTERFACES 2020; 12:42997-43008. [PMID: 32852189 PMCID: PMC7582621 DOI: 10.1021/acsami.0c11581] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 08/27/2020] [Indexed: 05/31/2023]
Abstract
Neural interfaces are the fundamental tools to understand the brain and cure many nervous-system diseases. For proper interfacing, seamless integration, efficient and safe digital-to-biological signal transduction, and long operational lifetime are required. Here, we devised a wireless optoelectronic pseudocapacitor converting the optical energy to safe capacitive currents by dissociating the photogenerated excitons in the photovoltaic unit and effectively routing the holes to the supercapacitor electrode and the pseudocapacitive electrode-electrolyte interfacial layer of PEDOT:PSS for reversible faradic reactions. The biointerface showed high peak capacitive currents of ∼3 mA·cm-2 with total charge injection of ∼1 μC·cm-2 at responsivity of 30 mA·W-1, generating high photovoltages over 400 mV for the main eye photoreception colors of blue, green, and red. Moreover, modification of PEDOT:PSS controls the charging/discharging phases leading to rapid capacitive photoresponse of 50 μs and effective membrane depolarization at the single-cell level. The neural interface has a device lifetime of over 1.5 years in the aqueous environment and showed stability without significant performance decrease after sterilization steps. Our results demonstrate that adopting the pseudocapacitance phenomenon on organic photovoltaics paves an ultraefficient, safe, and robust way toward communicating with biological systems.
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Affiliation(s)
- Mertcan Han
- Department
of Electrical and Electronics Engineering, Koc University, Istanbul 34450, Turkey
| | | | - Erdost Yildiz
- Koc
University Research Center for Translational Medicine, Koc University, Istanbul 34450, Turkey
| | - Rustamzhon Melikov
- Department
of Electrical and Electronics Engineering, Koc University, Istanbul 34450, Turkey
| | - Saliha Surme
- Molecular
Biology and Genetics, College of Science, Koc University, Istanbul 34450, Turkey
| | - Itir Bakis Dogru-Yuksel
- Graduate
School of Biomedical Sciences and Engineering, Koc University, Istanbul 34450, Turkey
| | - Ibrahim Halil Kavakli
- Molecular
Biology and Genetics, College of Science, Koc University, Istanbul 34450, Turkey
- College
of Engineering, Chemical and Biological Engineering, Koc University, Istanbul 34450, Turkey
| | - Afsun Sahin
- Koc
University Research Center for Translational Medicine, Koc University, Istanbul 34450, Turkey
- Department
of Ophthalmology, Medical School Koc University, Istanbul 34450, Turkey
| | - Sedat Nizamoglu
- Department
of Electrical and Electronics Engineering, Koc University, Istanbul 34450, Turkey
- Graduate
School of Biomedical Sciences and Engineering, Koc University, Istanbul 34450, Turkey
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12
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Srivastava SB, Melikov R, Yildiz E, Han M, Sahin A, Nizamoglu S. Efficient photocapacitors via ternary hybrid photovoltaic optimization for photostimulation of neurons. BIOMEDICAL OPTICS EXPRESS 2020; 11:5237-5248. [PMID: 33014611 PMCID: PMC7510852 DOI: 10.1364/boe.396068] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 07/16/2020] [Accepted: 08/03/2020] [Indexed: 05/31/2023]
Abstract
Optoelectronic photoelectrodes based on capacitive charge-transfer offer an attractive route to develop safe and effective neuromodulators. Here, we demonstrate efficient optoelectronic photoelectrodes that are based on the incorporation of quantum dots (QDs) into poly(3-hexylthiophene-2,5-diyl) (P3HT) and [6,6]-Phenyl-C61-butyric acid methyl ester (PCBM) bulk heterojunction. We control the performance of the photoelectrode by the blend ratio, thickness, and nanomorphology of the ternary bulk heterojunction. The optimization led to a photocapacitor that has a photovoltage of 450 mV under a light intensity level of 20 mW.cm-2 and a responsivity of 99 mA/W corresponding to the most light-sensitive organic photoelectrode reported to date. The photocapacitor can facilitate action potential generation by hippocampal neurons via burst waveforms at an intensity level of 20 mW.cm-2. Therefore, the results point to an alternative direction in the engineering of safe and ultra-light-sensitive neural interfaces.
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Affiliation(s)
| | - Rustamzhon Melikov
- Department of Electrical and Electronics Engineering, Koc University, Istanbul 34450, Turkey
| | - Erdost Yildiz
- Koc University Research Center for Translational Medicine, Koc University, Istanbul 34450, Turkey
| | - Mertcan Han
- Department of Electrical and Electronics Engineering, Koc University, Istanbul 34450, Turkey
| | - Afsun Sahin
- Koc University Research Center for Translational Medicine, Koc University, Istanbul 34450, Turkey
- Department of Ophthalmology, Medical School, Koc University, Istanbul 34450, Turkey
| | - Sedat Nizamoglu
- Department of Electrical and Electronics Engineering, Koc University, Istanbul 34450, Turkey
- Graduate School of Biomedical Sciences and Engineering, Koc University, Istanbul 34450, Turkey
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