Single-shot X-ray Dark-field Imaging

Wang, Zhili; Liu, Dalin; Ren, Kun; Shi, Xiaomin; Xia, Jianlin

doi:10.1017/s143192761801303x

Cited by 1 publication

(1 citation statement)

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“…Although Pt was reported to be dissolved and deposited on to the working electrode during the electrochemical study, the present setup used a layer of PDMS to avoid the direct contact between the reference and counter electrodes with the ITO electrode (as the cell shown in Scheme ). The PDMS layer separated the Pt wire from the ITO for more than 10 mm and the solution was kept still during measurement . Therefore, the dissolution of Pt during measurement time was negligible.…”

Section: Methodsmentioning

confidence: 99%

Structural Change of a Single Ag Nanoparticle Observed by Dark‐field Microspectroscopy

Pang

Liu

et al. 2018

ChemPhysChem

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Silver nanoparticles (AgNPs) have been widely used as photocatalysts and nanosensors. Observation of the spectroscopy of a single AgNP greatly helps us understand the catalytic characteristics and morphology change of the AgNP during reactions. In the present study, AgNPs physically adsorbed on indium tin oxide (ITO) conductive glass were electrochemically reduced and oxidized, and the plasmonic resonance Rayleigh scattering (PRRS) spectrum of an individual AgNP was observed under a dark-field microscopy (DFM) equipped with a spectrometer. The electrochemical oxidization of the AgNP under constant potential caused a redshift of the PRRS peak for 30±5 nm. However, electrochemical reduction of the AgNP could not make the PRRS peak completely shift back to the initial position. In situ AFM and SEM characterization confirmed that very small Ag fragments (<10 nm) formed around the AgNP core during electrochemical oxidization. Results showed that dark-field microspectroscopy could be used as a sensitive tool for estimating the morphology/structural changes of nanoparticles that can hardly be observed through the cyclic voltammograms of multiple AgNPs.

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Section: Methodsmentioning

confidence: 99%