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Cheng P, Wang H, Shi X. The effect of phenylalanine ligands on the chiral-selective oxidation of glucose on Au(111). NANOSCALE 2020; 12:3050-3057. [PMID: 31984970 DOI: 10.1039/c9nr09506c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
As typical glucose oxidase nanozymes, gold nanoparticles (Au NPs) have attracted much attention due to their wide-ranging applications. Ligand caps, as the "cure-all solution" for NPs, not only play important roles in the size and shape control of Au NPs but also influence their catalytic activity and selectivity. A deep understanding of the catalytic mechanism and precise description of the important role of ligands can provide possible ways to design functional Au NPs. Here, with the specific example of Au(111) capped with chiral phenylalanine (Phe), the chiral selective oxidation mechanism of glucose and the important role of the ligands were studied via first-principles calculations. All results show that the dehydrogenation of glucose to form glucono delta-lactone (GDL) is favored on clean Au(111), while the subsequent hydrolysis of GDL is the rate-limiting step for glucose oxidation. The flat and nonchiral Au(111) surface shows negligible selectivity in relation to the oxidation of d- and l-glucose, while chiral Phe-Au(111) shows selective adsorption towards d- and l-glucose. l-Phe-capped Au(111) prefers to adsorb d-glucose, while d-Phe-capped Au(111) prefers to adsorb l-glucose. Considering the three steps in the capped ligand catalysis (adsorption, replacement and reaction), we propose that the ligands play key roles in selectively adsorbing reactants before the subsequent exchange and reaction steps.
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Affiliation(s)
- Ping Cheng
- Laboratory of Theoretical and Computational Nanoscience, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, 100190, Beijing, China. and College of Science, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China
| | - Hui Wang
- Laboratory of Theoretical and Computational Nanoscience, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, 100190, Beijing, China.
| | - Xinghua Shi
- Laboratory of Theoretical and Computational Nanoscience, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of Sciences, 100190, Beijing, China. and University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, China
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2
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Bevan KH, Roy-Gobeil A, Miyahara Y, Grutter P. Relating Franck-Condon blockade to redox chemistry in the single-particle picture. J Chem Phys 2018; 149:104109. [DOI: 10.1063/1.5043480] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Kirk H. Bevan
- Division of Materials Engineering, Faculty of Engineering, McGill University, Montréal, Québec H3A 0C5, Canada
| | - Antoine Roy-Gobeil
- Department of Physics, McGill University, 3600 Rue University, Montréal, Québec H3A 2T8, Canada
| | - Yoichi Miyahara
- Department of Physics, McGill University, 3600 Rue University, Montréal, Québec H3A 2T8, Canada
| | - Peter Grutter
- Department of Physics, McGill University, 3600 Rue University, Montréal, Québec H3A 2T8, Canada
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3
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San KA, Shon YS. Synthesis of Alkanethiolate-Capped Metal Nanoparticles Using Alkyl Thiosulfate Ligand Precursors: A Method to Generate Promising Reagents for Selective Catalysis. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E346. [PMID: 29783714 PMCID: PMC5977360 DOI: 10.3390/nano8050346] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 05/15/2018] [Accepted: 05/15/2018] [Indexed: 12/27/2022]
Abstract
Evaluation of metal nanoparticle catalysts functionalized with well-defined thiolate ligands can be potentially important because such systems can provide a spatial control in the reactivity and selectivity of catalysts. A synthetic method utilizing Bunte salts (sodium S-alkylthiosulfates) allows the formation of metal nanoparticles (Au, Ag, Pd, Pt, and Ir) capped with alkanethiolate ligands. The catalysis studies on Pd nanoparticles show a strong correlation between the surface ligand structure/composition and the catalytic activity and selectivity for the hydrogenation/isomerization of alkenes, dienes, trienes, and allylic alcohols. The high selectivity of Pd nanoparticles is driven by the controlled electronic properties of the Pd surface limiting the formation of Pd⁻alkene adducts (or intermediates) necessary for (additional) hydrogenation. The synthesis of water soluble Pd nanoparticles using ω-carboxylate-S-alkanethiosulfate salts is successfully achieved and these Pd nanoparticles are examined for the hydrogenation of various unsaturated compounds in both homogeneous and heterogeneous environments. Alkanethiolate-capped Pt nanoparticles are also successfully synthesized and further investigated for the hydrogenation of various alkynes to understand their geometric and electronic surface properties. The high catalytic activity of activated terminal alkynes, but the significantly low activity of internal alkynes and unactivated terminal alkynes, are observed for Pt nanoparticles.
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Affiliation(s)
- Khin Aye San
- Department of Chemistry and Biochemistry, California State University Long Beach, 1250 Bellflower Blvd., Long Beach, CA 90840, USA.
| | - Young-Seok Shon
- Department of Chemistry and Biochemistry, California State University Long Beach, 1250 Bellflower Blvd., Long Beach, CA 90840, USA.
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4
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Raudino A, Raciti D, Corti M. Anomalous Behavior of Ultra-Low-Amplitude Capillary Waves. A Glimpse of the Viscoelastic Properties of Interfacial Water? LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:6439-6448. [PMID: 28520431 DOI: 10.1021/acs.langmuir.7b00895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We investigate, both theoretically and by a differential interferometric technique, the behavior of large-wavelength capillary waves (of the order of 10-4 m) selectively excited at the surface of drops and bubbles with typical eigenfrequencies of the order of 102 Hz. The resonance peaks of gas bubbles or hydrocarbon drops in water (radius less than 1 mm) highlight anomalously small dissipation in the region of ultralow (sub-nanometric) oscillation amplitudes, reaching a plateau at higher amplitudes. This is in sharp contrast to the usual oscillating systems, where an anomalous behavior holds at large amplitudes alone. Dissipation is strongly dependent on the excited vibrational modes and, in spite of remarkable numerical differences, water-vapor and water-hydrocarbon interfaces exhibit the same overall trend. A phenomenological model was developed, based on the assumption that water possesses a threshold viscoelasticity, above which it behaves like a regular viscous fluid. The well-known Deborah number was then estimated within the anomalous region and found to lie in the range of viscoelastic fluids. In agreement with previous studies of nanohydrodynamics (e.g., atomic force microscopy measurements with sub-nanometric tip motions), the present one lends support to the idea that every self-aggregating fluid exhibits yield stress behavior, including classical Newtonian fluids like water. The essential requirement is that the applied perturbation lie below a critical threshold, above which viscous behavior is recovered. Our differential interferometric technique seems particularly suitable for this type of studies, as it allows measurement of long-wavelength capillary waves with sub-nanometric resolution on the oscillation amplitudes.
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Affiliation(s)
- Antonio Raudino
- Department of Chemical Sciences, University of Catania , Viale A. Doria 6, 95125, Catania, Italy
| | - Domenica Raciti
- Department of Chemical Sciences, University of Catania , Viale A. Doria 6, 95125, Catania, Italy
| | - Mario Corti
- CNR-IPCF , Viale F. Stagno d'Alcontres 37, 98158 Messina, Italy
- LITA, University of Milano , Via Fratelli Cervi 93, 20090 Segrate Milano, Italy
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5
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San KA, Chen V, Shon YS. Preparation of Partially Poisoned Alkanethiolate-Capped Platinum Nanoparticles for Hydrogenation of Activated Terminal Alkynes. ACS APPLIED MATERIALS & INTERFACES 2017; 9:9823-9832. [PMID: 28252941 PMCID: PMC5364944 DOI: 10.1021/acsami.7b02765] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 03/02/2017] [Indexed: 05/26/2023]
Abstract
Stable and isolable alkanethiolate-stabilized Pt nanoparticles (PtNP) were synthesized using the two-phase thiosulfate method with sodium S-alkylthiosulfate as ligand precursor. The mechanistic formation of octanethiolate-capped PtNP (Pt-SC8) from both sodium S-octylthiosulfate and 1-octanethiol ligands was investigated by using 1H NMR and UV-vis spectroscopies, which revealed the formation of different Pt complexes as the reaction intermediates. The synthesis using S-octylthiosulfate ligand precursor produced Pt-SC8 in higher yields than that using 1-octanethiol ligand. The obtained nanoparticles were characterized by 1H NMR, UV-vis spectroscopy, infrared spectroscopy (IR), thermogravimetric analysis, and transmission electron microscopy (TEM). The results obtained from 1H NMR, IR, and UV-vis spectroscopy were consistent with the formation of stable and pure alkanethiolate-capped PtNP. TEM images of PtNP confirmed their small average core size (∼1.5 nm) and high monodispersity. The partially poisoned PtNP with thiolate monolayer ligands were further investigated for the hydrogenation of various alkynes to understand the organic ligands-induced geometric and electronic surface properties of colloidal Pt nanoparticle catalysts. The high catalytic activity of activated terminal alkynes, but the significantly low activity of internal alkynes and unactivated terminal alkynes, were observed under the mild reaction conditions (room temperature and atmospheric pressure). These results indicated that the presence of alkanethiolate ligands could decrease the coordination activity of PtNP surface especially for the bulkier and unactivated substrates.
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6
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Lee Y, Noh S, Kim MS, Kong HJ, Im K, Kwon OS, Kim S, Yoon H. The effect of nanoparticle packing on capacitive electrode performance. NANOSCALE 2016; 8:11940-8. [PMID: 27242155 DOI: 10.1039/c6nr02424f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Nanoparticles pack together to form macro-scale electrodes in various types of devices, and thus, optimization of the nanoparticle packing is a prerequisite for the realization of a desirable device performance. In this work, we provide in-depth insight into the effect of nanoparticle packing on the performance of nanoparticle-based electrodes by combining experimental and computational findings. As a model system, polypyrrole nanospheres of three different diameters were used to construct pseudocapacitive electrodes, and the performance of the electrodes was examined at various nanosphere diameter ratios and mixed weight fractions. Two numerical algorithms are proposed to simulate the random packing of the nanospheres on the electrode. The binary nanospheres exhibited diverse, complicated packing behaviors compared with the monophasic packing of each nanosphere species. The packing of the two nanosphere species with lower diameter ratios at an optimized composition could lead to more dense packing of the nanospheres, which in turn could contribute to better device performance. The dense packing of the nanospheres would provide more efficient transport pathways for ions because of the reduced inter-nanosphere pore size and enlarged surface area for charge storage. Ultimately, it is anticipated that our approach can be widely used to define the concept of "the best nanoparticle packing" for desirable device performance.
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Affiliation(s)
- Younghee Lee
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju 61186, South Korea
| | - Seonmyeong Noh
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju 61186, South Korea
| | - Min-Sik Kim
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju 61186, South Korea
| | - Hye Jeong Kong
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju 61186, South Korea
| | - Kyungun Im
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju 61186, South Korea
| | - Oh Seok Kwon
- BioNanotechnology Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejon 34141, South Korea
| | - Sungmin Kim
- Department of Textiles, Merchandising, and Fashion Design, Seoul National University, Seoul 08826, South Korea.
| | - Hyeonseok Yoon
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju 61186, South Korea and School of Polymer Science and Engineering, Chonnam National University, Gwangju 61186, South Korea.
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7
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Lee SW, Lee EH, Thiel G, Van Etten JL, Saraf RF. Noninvasive Measurement of Electrical Events Associated with a Single Chlorovirus Infection of a Microalgal Cell. ACS NANO 2016; 10:5123-30. [PMID: 27139597 DOI: 10.1021/acsnano.6b00299] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Chlorovirus Paramecium bursaria chlorella virus 1 (PBCV-1) contains a viral-encoded K(+) channel imbedded in its internal membrane, which triggers host plasma membrane depolarization during virus infection. This early stage of infection was monitored at high resolution by recording the cell membrane depolarization of a single Chlorella cell during infection by a single PBCV-1 particle. The measurement was achieved by depositing the cells onto a network of one-dimensional necklaces of Au nanoparticles, which spanned two electrodes 70 μm apart. The nanoparticle necklace array has been shown to behave as a single-electron device at room temperature. The resulting electrochemical field-effect transistor (eFET) was gated by the cell membrane potential, which allowed a quantitative measurement of the electrophysiological changes across the rigid cell wall of the microalgae due to a single viral attack at high sensitivity. The single viral infection signature was quantitatively confirmed by coupling the eFET measurement with a method in which a single viral particle was delivered for infection by a scanning probe microscope cantilever.
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Affiliation(s)
- Seung-Woo Lee
- Department of Chemical and Biomolecular Engineering, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States
- Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology (KIST) , Hwarang-ro 14-gil 5, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Eun-Hee Lee
- Department of Chemical and Biomolecular Engineering, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States
- Department of Environmental Science and Engineering, Ewha Womans University , Ewhayeodae-gil 52, Seodaemun-gu, Seoul 03760, Republic of Korea
| | - Gerhard Thiel
- Department of Biology, Technische Universität-Darmstadt , Schnittspahnstrasse 3, Darmstadt 64287, Germany
| | - James L Van Etten
- Department of Plant Pathology and Nebraska Center for Virology, University of Nebraska-Lincoln , Lincoln, Nebraska 68583, United States
| | - Ravi F Saraf
- Department of Chemical and Biomolecular Engineering, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States
- Nebraska Center for Materials and Nanosciences, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States
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8
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Habibi B, Delnavaz N. Electrooxidation of glycerol on nickel and nickel alloy (Ni–Cu and Ni–Co) nanoparticles in alkaline media. RSC Adv 2016. [DOI: 10.1039/c5ra26006j] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In the present study, nickel (Ni) and Ni alloy (Ni–Cu and Ni–Co) nanoparticles modified carbon-ceramic electrodes (Ni/CCE, Ni–Cu/CCE and Ni–Co/CCE) were prepared by an electrochemical process for the oxidation of glycerol.
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Affiliation(s)
- Biuck Habibi
- Electroanalytical Chemistry Laboratory
- Department of Chemistry
- Faculty of Sciences
- Azarbaijan Shahid Madani University
- Tabriz
| | - Nasrin Delnavaz
- Electroanalytical Chemistry Laboratory
- Department of Chemistry
- Faculty of Sciences
- Azarbaijan Shahid Madani University
- Tabriz
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9
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Gavia DJ, Shon YS. Catalytic Properties of Unsupported Palladium Nanoparticle Surfaces Capped with Small Organic Ligands. ChemCatChem 2015; 7:892-900. [PMID: 25937846 PMCID: PMC4415887 DOI: 10.1002/cctc.201402865] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Indexed: 11/11/2022]
Abstract
This Minireview summarizes a variety of intriguing catalytic studies accomplished by employing unsupported, either solubilized or freely mobilized, and small organic ligand-capped palladium nanoparticles as catalysts. Small organic ligands are gaining more attention as nanoparticle stabilizers and alternates to larger organic supports, such as polymers and dendrimers, owing to their tremendous potential for a well-defined system with spatial control in surrounding environments of reactive surfaces. The nanoparticle catalysts are grouped depending on the type of surface stabilizers with reactive head groups, which include thiolate, phosphine, amine, and alkyl azide. Applications for the reactions such as hydrogenation, alkene isomerization, oxidation, and carbon-carbon cross coupling reactions are extensively discussed. The systems defined as "ligandless" Pd nanoparticle catalysts and solvent (e.g. ionic liquid)-stabilized Pd nanoparticle catalysts are not discussed in this review.
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Affiliation(s)
- Diego J. Gavia
- Department of Chemistry and Biochemistry, California State University, Long Beach, 1250 Bellflower Blvd., Long Beach, California, 90840-9507 (USA)
| | - Young-Seok Shon
- Department of Chemistry and Biochemistry, California State University, Long Beach, 1250 Bellflower Blvd., Long Beach, California, 90840-9507 (USA)
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10
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Dimensionality-dependent charge transport in close-packed nanoparticle arrays: from 2D to 3D. Sci Rep 2014; 4:7565. [PMID: 25523836 PMCID: PMC4271260 DOI: 10.1038/srep07565] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Accepted: 12/01/2014] [Indexed: 11/17/2022] Open
Abstract
Charge transport properties in close-packed nanoparticle arrays with thickness crossing over from two dimensions to three dimensions have been studied. The dimensionality transition of nanoparticle arrays was realized by continually printing spatially well-defined nanoparticle monolayers on top of the device in situ. The evolution of charge transport properties depending on the dimensionality has been investigated in both the Efros-Shaklovskii variable-range-hopping (ES-VRH) (low temperature) regime and the sequential hopping (SH) (medium temperature) regime. We find that the energy barriers to transport decrease when the thickness of nanoparticle arrays increases from monolayer to multilayers, but start to level off at the thickness of 4–5 monolayers. The energy barriers are characterized by the coefficient βD at ES-VRH regime and the activation energy Ea at SH regime. Moreover, a turning point for the temperature coefficient of conductance was observed in multilayer nanoparticle arrays at high temperature, which is attributed to the increasing mobility with decreasing temperature of hopping transport in three dimensions.
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11
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Ong JKY, Moore D, Kane J, Saraf RF. Negative printing by soft lithography. ACS APPLIED MATERIALS & INTERFACES 2014; 6:14278-14285. [PMID: 25095721 DOI: 10.1021/am5035939] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In inkless microcontact printing (IμCP) by soft lithography, the poly(dimethylsiloxane) (PDMS) stamp transfers uncured polymer to a substrate corresponding to its pattern. The spontaneous diffusion of PDMS oligomers to the surface of the stamp that gives rise to this deleterious side effect has been leveraged to fabricate a variety of devices, such as organic thin film transistors, single-electron devices, and biomolecular chips. Here we report an anomalous observation on a partially cured PDMS stamp where the transfer of oligomers onto Au occurred on regions that were not in contact with the stamp, while the surface in contact with the stamp was pristine with no polymer. On the SiO2 surface of the same chip, as expected, the transfer of PDMS occurred exclusively on regions in contact with the stamp. The printing on Au was quantified by a novel method where the submonolayer of PDMS transfer was measured by probing the local electrochemical passivation of the Au. The local transfer of polymer on SiO2 (and also Au) was measured by selective deposition of Au nanoparticle necklaces that exclusively deposited on PDMS at submonolayer sensitivity. It was discovered that the selectivity and sharpness of PDMS deposition on Au for inkless printing (i.e., negative) is significantly better than the traditional (positive) microcontact printing where the stamp is "inked" with low molecular weight PDMS.
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Affiliation(s)
- Jason Kee Yang Ong
- Department of Chemical and Biomolecular Engineering and ‡Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States
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12
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Lee SW, Lee EH, Saraf RF. Dense Array of Nanoparticles as a Large-Area Nanoelectrode for Sensors: An Oxymoron Mesomaterial? ChemElectroChem 2014. [DOI: 10.1002/celc.201402146] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Lee EH, Lee SW, Saraf RF. Noninvasive measurement of membrane potential modulation in microorganisms: photosynthesis in green algae. ACS NANO 2014; 8:780-6. [PMID: 24354302 DOI: 10.1021/nn405437z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Cell membrane potential (CMP) modulation is a physical measurement to quantitatively probe cell physiology in real time at high specificity. Electrochemical field effect transistors (eFETs) made from graphene and Si nanowire provide strong mechanical and electrical coupling with neurons and muscle cells to noninvasively measure CMP at high sensitivity. To date, there are no noninvasive methods to study electrophysiology of microorganisms because of stiff cell walls and significantly smaller membrane polarizations. An eFET made from the smallest possible nanostructure, a nanoparticle, with sensitivity to a single-electron charge is developed to noninvasively measure CMP modulation in algae. The applicability of the device is demonstrated by measuring CMP modulation due to a light-induced proton gradient inside the chloroplast during photosynthesis. The ∼9 mV modulation in CMP in algae is consistent with the absorbance spectrum of chlorophyll, photosynthetic pathway, and inorganic carbon source concentration in the environment. The method can potentially become a routine method to noninvasively study electrophysiology of cells, such as microorganisms for biofuels.
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Affiliation(s)
- Eun-Hee Lee
- Chemical and Biomolecular Engineering, University of Nebraska-Lincoln , Lincoln, Nebraska 68588, United States
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14
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Song Y, Chen S. Janus Nanoparticles: Preparation, Characterization, and Applications. Chem Asian J 2013; 9:418-30. [DOI: 10.1002/asia.201301398] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Revised: 11/15/2013] [Indexed: 01/06/2023]
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15
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Duan C, Wang Y, Sun J, Guan C, Grunder S, Mayor M, Peng L, Liao J. Controllability of the Coulomb charging energy in close-packed nanoparticle arrays. NANOSCALE 2013; 5:10258-10266. [PMID: 24056932 DOI: 10.1039/c3nr02334f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We studied the electronic transport properties of metal nanoparticle arrays, particularly focused on the Coulomb charging energy. By comparison, we confirmed that it is more reasonable to estimate the Coulomb charging energy using the activation energy from the temperature-dependent zero-voltage conductance. Based on this, we systematically and comprehensively investigated the parameters that could be used to tune the Coulomb charging energy in nanoparticle arrays. We found that four parameters, including the particle core size, the inter-particle distance, the nearest neighboring number, and the dielectric constant of ligand molecules, could significantly tune the Coulomb charging energy.
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Affiliation(s)
- Chao Duan
- Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, China.
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16
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Ong JKY, Nguyen CV, Sayood S, Saraf RF. Imaging electroluminescence from individual nanoparticles in an array exhibiting room temperature single electron effect. ACS NANO 2013; 7:7403-7410. [PMID: 23909628 DOI: 10.1021/nn403165q] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Electroluminescence (EL) from the monolayer of a network of a one-dimensional (1D) necklace of 10 nm Au particles (nano)cemented by CdS is imaged. The EL and photoluminescence (PL) spectra confirm the emission from CdS. The EL emission blinks and is highly specular. The position of the speckles from individual CdS cement sites is independent of magnitude and polarity of the applied bias. The EL is explained by field-assisted ionization of the cement due to high internal fields in the array caused by stationary local charging that also leads to robust single electron effect at room temperature.
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Affiliation(s)
- Jason Kee Yang Ong
- Department of Chemical and Biomolecular Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, United States
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17
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Yu C, Lee SW, Ong J, Moore D, Saraf RF. Single electron transistor in aqueous media. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:3079-3084. [PMID: 23653239 DOI: 10.1002/adma.201204162] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2012] [Revised: 01/14/2013] [Indexed: 06/02/2023]
Abstract
A gold nanoparticle necklace array spanning a ∼30-micrometer-wide channel shows a robust coulomb blockade effect at room temperature with a threshold of 1V in air. When this device is operated in the aqueous solution, a gain of ∼130 fold in conductance is obtained in electrochemical gating, significantly higher than other nanomaterial-based electrochemical transistors.
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Affiliation(s)
- Chichao Yu
- Chemical and Biomolecular Engineering, Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE 68588, USA
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18
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Mangold MA, Calame M, Mayor M, Holleitner AW. Negative differential photoconductance in gold nanoparticle arrays in the Coulomb blockade regime. ACS NANO 2012; 6:4181-4189. [PMID: 22497236 DOI: 10.1021/nn300673t] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigate the photoconductance of gold nanoparticle arrays in the Coulomb blockade regime. Two-dimensional, hexagonal crystals of nanoparticles are produced by self-assembly. The nanoparticles are weakly coupled to their neighbors by a tunneling conductance. At low temperatures, the single electron charging energy of the nanoparticles dominates the conductance properties of the array. The Coulomb blockade of the nanoparticles can be lifted by optical excitation with a laser beam. The optical excitation leads to a localized heating of the arrays, which in turn gives rise to a local change in conductance and a redistribution of the overall electrical potential in the arrays. We introduce a dual-beam optical excitation technique to probe the distribution of the electrical potential in the nanoparticle array. A negative differential photoconductance is the direct consequence of the redistribution of the electrical potential upon lifting of the Coulomb blockade. On the basis of our model, we calculate the optically induced current from the dark current-voltage characteristics of the nanoparticle array. The calculations closely reproduce the experimental observations.
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Affiliation(s)
- Markus A Mangold
- Walter Schottky Institut and Physik-Department, Technische Universität München, Am Coulombwall 4a, 85748 Garching, Germany
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