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Demirdjian B, Ozerov I, Bedu F, Ranguis A, Henry CR. CO and O 2 Adsorption and CO Oxidation on Pt Nanoparticles by Indirect Nanoplasmonic Sensing. ACS OMEGA 2021; 6:13398-13405. [PMID: 34056487 PMCID: PMC8158802 DOI: 10.1021/acsomega.1c01487] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 04/27/2021] [Indexed: 06/12/2023]
Abstract
We used indirect nanoplasmonic sensing (INPS) coupled with mass spectrometry to study CO and oxygen adsorption as well as CO oxidation, on Pt nanoparticles, in the Torr pressure range. Due to an optimization of the physical parameters of our plasmonic sample, we obtain a highly sensitive probe that can detect gas adsorption of a few hundredths of a monolayer, even with a very low number density of Pt particles. Moreover and for the first time, a similarity is observed between the sign and the evolution of the localized surface plasmon resonance (LSPR) peak shift and the work function measurements for CO and oxygen chemisorption. Controlling the size, shape, and surface density of Pt particles, the turnover frequency (TOF) has also been accurately determined. For similar experimental conditions, the TOF is close to those measured on Pt/oxide powder catalysts and Pt(100) single crystals.
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Xiang L, Zhang P, Liu C, He X, Li HB, Li Y, Wang Z, Hihath J, Kim SH, Beratan DN, Tao N. Conductance and configuration of molecular gold-water-gold junctions under electric fields. MATTER 2020; 3:166-179. [PMID: 33103114 PMCID: PMC7584381 DOI: 10.1016/j.matt.2020.03.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Water molecules can mediate charge transfer in biological and chemical reactions by forming electronic coupling pathways. Understanding the mechanism requires a molecular-level electrical characterization of water. Here, we describe the measurement of single water molecular conductance at room temperature, characterize the structure of water molecules using infrared spectroscopy, and perform theoretical studies to assist in the interpretation of the experimental data. The study reveals two distinct states of water, corresponding to a parallel and perpendicular orientation of the molecules. Water molecules switch from parallel to perpendicular orientations on applying an electric field, producing switching from high to low conductance states, thus enabling the determination of single water molecular dipole moments. The work further shows that water-water interactions affect the atomic scale configuration and conductance of water molecules. These findings demonstrate the importance of the discrete nature of water molecules in electron transfer and set limits on water-mediated electron transfer rates.
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Affiliation(s)
- Limin Xiang
- Biodesign Center for Biosensors and Bioelectronics, Biodesign Institute, Arizona State University, Tempe, Arizona 85287, USA
- Lead contact
| | - Peng Zhang
- Departments of Chemistry and Physics, Duke University, Durham, North Carolina 27708, USA
| | - Chaoren Liu
- Departments of Chemistry and Physics, Duke University, Durham, North Carolina 27708, USA
| | - Xin He
- Department of Chemical Engineering and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Haipeng B. Li
- Department of Electrical and Computing Engineering, University of California, Davis, Davis, California 95616, USA
| | - Yueqi Li
- Biodesign Center for Biosensors and Bioelectronics, Biodesign Institute, Arizona State University, Tempe, Arizona 85287, USA
| | - Zixiao Wang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | - Joshua Hihath
- Department of Electrical and Computing Engineering, University of California, Davis, Davis, California 95616, USA
| | - Seong H. Kim
- Department of Chemical Engineering and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - David N. Beratan
- Departments of Chemistry and Physics, Duke University, Durham, North Carolina 27708, USA
- Department of Biochemistry, Duke University, Durham, North Carolina 27710, USA
| | - Nongjian Tao
- Biodesign Center for Biosensors and Bioelectronics, Biodesign Institute, Arizona State University, Tempe, Arizona 85287, USA
- School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287, USA
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Wong TSB, Newman RC. A novel application of nanoporous gold to humidity sensing: a framework for a general volatile compound sensor. NANOSCALE ADVANCES 2020; 2:777-784. [PMID: 36133239 PMCID: PMC9418575 DOI: 10.1039/d0na00010h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Accepted: 01/07/2020] [Indexed: 06/16/2023]
Abstract
Volatile organic compounds (VOC) are ubiquitous in industrial applications creating a pressing desire for novel transduction pathways to build a broad family of new gas sensors. Nanoporous gold (NPG) is a material with a vast range of untapped potential applications; offering a high surface area found generally in nanomaterials, while also being comparatively simple to fabricate. NPG based sensors can also leverage the unique physics of gold at the nanoscale. In this work, we leverage the multiple unique nanoscale phenomena associated with NPG to demonstrate two novel transduction mechanisms to sense humidity, a model compound. Through direct electrical measurements of NPG, we were able to sense changes in the electronic properties of NPG induced by ambient humidity. We propose two novel transduction mechanisms: chemoresistive changes induced by surface adsorption and electrochemical capacitive changes induced by the electric double layer to detect humidity. To our knowledge this is the first reported application of both these mechanisms for sensing any volatile compounds utilizing NPG.
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Affiliation(s)
- Timothy S B Wong
- Department of Chemical Engineering and Applied Chemistry, University of Toronto 200 College Street Toronto ON M5S 3E5 Canada
| | - Roger C Newman
- Department of Chemical Engineering and Applied Chemistry, University of Toronto 200 College Street Toronto ON M5S 3E5 Canada
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Du B, Yang D, Ruan Y, Jia P, Ebendorff-Heidepriem H. Compact plasmonic fiber tip for sensitive and fast humidity and human breath monitoring. OPTICS LETTERS 2020; 45:985-988. [PMID: 32058524 DOI: 10.1364/ol.381085] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 01/09/2020] [Indexed: 06/10/2023]
Abstract
We demonstrate a plasmonic fiber tip for relative humidity (RH) detection by integrating a gold nanomembrane onto the end-face of a multimode optical fiber via a flexible and high-efficiency transfer method. Fast water condensation/evaporation is responsible for the high performance of the fiber tip in response to RH. A high sensitivity of 279 pm/%RH is obtained in the range of $ 11\% \sim 92\% {\rm RH} $11%∼92%RH. Taking advantage of the fast dynamics (response and recovery times of 156 ms and 277 ms), the plasmonic fiber tip offers an excellent detection capability to human breaths at varied frequencies and depths. The compact, easy-fabrication, and fast-dynamics plasmonic platform has versatile potential for practical applications, including environmental and healthcare monitoring, as well as biochemical sensing.
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Strait JH, Holland G, Zhu W, Zhang C, Ilic BR, Agrawal A, Pacifici D, Lezec HJ. Revisiting the Photon-Drag Effect in Metal Films. PHYSICAL REVIEW LETTERS 2019; 123:053903. [PMID: 31491313 PMCID: PMC6767616 DOI: 10.1103/physrevlett.123.053903] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Indexed: 06/10/2023]
Abstract
The photon-drag effect, the rectified current in a medium induced by conservation of momentum of absorbed or redirected light, is a unique probe of the detailed mechanisms underlying radiation pressure. We revisit this effect in gold, a canonical Drude metal. We discover that the signal for p-polarized illumination in ambient air is affected in both sign and magnitude by adsorbed molecules, opening previous measurements for reinterpretation. Further, we show that the intrinsic sign of the photon-drag effect is contrary to the prevailing intuitive model of direct momentum transfer to free electrons.
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Affiliation(s)
- Jared H. Strait
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Glenn Holland
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Wenqi Zhu
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
- Maryland Nanocenter, University of Maryland, College Park, MD 20742
| | - Cheng Zhang
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
- Maryland Nanocenter, University of Maryland, College Park, MD 20742
| | - Bojan R. Ilic
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
| | - Amit Agrawal
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
- Maryland Nanocenter, University of Maryland, College Park, MD 20742
| | - Domenico Pacifici
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
- School of Engineering and Department of Physics, Brown University, Providence, RI 02906
| | - Henri J. Lezec
- Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899
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Lv X, Geng Z, Su Y, Fan Z, Wang S, Fang W, Chen H. Label-Free Exosome Detection Based on a Low-Cost Plasmonic Biosensor Array Integrated with Microfluidics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9816-9824. [PMID: 31268344 DOI: 10.1021/acs.langmuir.9b01237] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Localized surface plasmon resonance-based plasmonic biosensors are interesting candidates for the design of portable optical biosensor platforms owing to their integration, miniaturization, multiparameter, real-time, and label-free detection characteristics. Plasmonic biosensor arrays that have been combined with microfluidics have been developed herein to detect exosomes label-free. Gold nano-ellipsoid arrays were fabricated with low-cost anodic aluminum oxide thin films that act as shadow masks for evaporation of Au. The nano-ellipsoid arrays were integrated with a microfluidic chip to achieve multiparameter detection. The anti-CD63 antibody that is specific to the exosome transmembrane protein CD63 is modified on the surface of the nano-ellipsoids. Exosome samples were injected into the biosensor platform at different concentrations and detected successfully. The detection limit was 1 ng/mL. The proposed plasmonic biosensor array can be universally applicable for the detection of other biomarkers by simply changing the antibody on the surface of the Au nano-ellipsoids. Moreover, this biosensor platform is envisaged to be potentially useful in the development of low-cost plasmonic-based biosensors for biomarker detection and for the investigation of exosomes for noninvasive disease diagnoses.
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Affiliation(s)
- Xiaoqing Lv
- State Key Laboratory of Integrated Opoelectronics, Institute of Semiconductors , Chinese Academy of Sciences , Beijing 100083 , China
| | - Zhaoxin Geng
- State Key Laboratory of Integrated Opoelectronics, Institute of Semiconductors , Chinese Academy of Sciences , Beijing 100083 , China
- School of Information Engineering , Minzu University of China , Beijing 100081 , China
| | - Yue Su
- State Key Laboratory of Integrated Opoelectronics, Institute of Semiconductors , Chinese Academy of Sciences , Beijing 100083 , China
- College of Materials Science and Opto-Electronic Technology , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Zhiyuan Fan
- State Key Laboratory of Integrated Opoelectronics, Institute of Semiconductors , Chinese Academy of Sciences , Beijing 100083 , China
- College of Materials Science and Opto-Electronic Technology , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Shicai Wang
- State Key Laboratory of Integrated Opoelectronics, Institute of Semiconductors , Chinese Academy of Sciences , Beijing 100083 , China
- State Key Laboratory of Crystal Materials , Shandong University , Jinan 250022 , China
| | - Weihao Fang
- State Key Laboratory of Integrated Opoelectronics, Institute of Semiconductors , Chinese Academy of Sciences , Beijing 100083 , China
- College of Materials Science and Opto-Electronic Technology , University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Hongda Chen
- State Key Laboratory of Integrated Opoelectronics, Institute of Semiconductors , Chinese Academy of Sciences , Beijing 100083 , China
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Gas Sensing with Nanoplasmonic Thin Films Composed of Nanoparticles (Au, Ag) Dispersed in a CuO Matrix. COATINGS 2019. [DOI: 10.3390/coatings9050337] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Magnetron sputtered nanocomposite thin films composed of monometallic Au and Ag, and bimetallic Au-Ag nanoparticles, dispersed in a CuO matrix, were prepared, characterized, and tested, which aimed to find suitable nano-plasmonic platforms capable of detecting the presence of gas molecules. The Localized Surface Plasmon Resonance phenomenon, LSPR, induced by the morphological changes of the nanoparticles (size, shape, and distribution), and promoted by the thermal annealing of the films, was used to tailor the sensitivity to the gas molecules. Results showed that the monometallic films, Au:CuO and Ag:CuO, present LSPR bands at ~719 and ~393 nm, respectively, while the bimetallic Au-Ag:CuO film has two LSPR bands, which suggests the presence of two noble metal phases. Through transmittance-LSPR measurements, the bimetallic films revealed to have the highest sensitivity to the refractive index changes, as well as high signal-to-noise ratios, respond consistently to the presence of a test gas.
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