The integration of Atomic Force Microscopy and Raman spectroscopy is tested for use in heterogeneous catalysis research by a preliminary investigation, the photo-oxidation of rhodamine-6G. Temperature and atmosphere were varied in an in situ cell to show compatibility with realistic reaction conditions.
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http://dx.doi.org/10.1039/c2cc15939b | DOI Listing |
Nanomaterials (Basel)
November 2023
Institute of Materials Engineering, University of Siegen, 57076 Siegen, Germany.
Boron-doped diamond (BDD) thin film electrodes have great application potential in water treatment. However, the high electrode energy consumption due to high resistance directly limits the application range of existing BDD electrodes. In this paper, the BDD/graphene/BDD (DGD) sandwich structure electrode was prepared, which effectively improved the conductivity of the electrode.
View Article and Find Full Text PDFMaterials (Basel)
August 2023
Ioffe Institute, 26 Politekhnicheskaya, 194021 St. Petersburg, Russia.
The quality of graphene intended for use in biosensors was assessed on manufactured chips using a set of methods including atomic force microscopy (AFM), Raman spectroscopy, and low-frequency noise investigation. It is shown that local areas of residues on the graphene surface, formed as a result of the interaction of graphene with a photoresist at the initial stage of chip development, led to a spread of chip resistance (R) in the range of 1-10 kOhm and to an increase in the root mean square (RMS) roughness up to 10 times, which can significantly worsen the reproducibility of the parameters of graphene chips for biosensor applications. It was observed that the control of the photoresist residues after photolithography (PLG) using AFM and subsequent additional cleaning reduced the spread of R values in chips to 1-1.
View Article and Find Full Text PDFNanotechnology
July 2023
Department of Mechanical Engineering, State University of New York at Binghamton, Binghamton, NY 13902, United States of America.
The oxidation mechanism of atomically thin molybdenum disulfide (MoS) plays a critical role in its nanoelectronics, optoelectronics, and catalytic applications, where devices often operate in an elevated thermal environment. In this study, we systematically investigate the oxidation of mono- and few-layer MoSflakes in the air at temperatures ranging from 23 °C to 525 °C and relative humidities of 10%-60% by using atomic force microscopy (AFM), Raman spectroscopy and x-ray photoelectron spectroscopy. Our study reveals the formation of a uniform nanometer-thick physical adsorption layer on the surface of MoS, which is attributed to the adsorption of ambient moisture.
View Article and Find Full Text PDFACS Appl Mater Interfaces
August 2022
Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
The physical properties of copper oxide high-temperature superconductors have been studied extensively, such as the band structure and doping effects of BiSrCaCuO (Bi-2212). However, some chemical-related properties of these superconductors are rarely reported, such as their stability in water-bearing environments. Herein, we report experiments combined with ab initio calculations that address the effects of water in contact with Bi-2212.
View Article and Find Full Text PDFRev Sci Instrum
July 2022
School of Physics, Beihang University, Beijing 100191, People's Republic of China.
The emergence of functional materials, especially energy materials made up of various structures with different properties, requires the development of complementary or integrated characterization technologies. The combination of atomic force microscopy and Raman spectroscopy (AFM-Raman) offers a powerful technique for the in situ characterization of physical properties (AFM) and chemical composition (Raman) of materials simultaneously. To further extend the potential application in the battery's field, we here present an electrochemical AFM-Raman (EC-AFM-Raman) in the reflection mode, developed by designing a novel structure including water-immersion objective lens-based optics for high-sensitivity Raman excitation/collection, optical level detection for AFM imaging in the solution, and a dual-cell for electrochemical reaction.
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