Spatiotemporal Heterogeneity of Reactions in Solution Observed with High‐Speed Single‐Nanorod Rotational Sensing. Issue 25 (14th May 2019)

• Record Type: Journal Article
• Authors: Pan, Qi; Zhao, Hansen; Lin, Xijian; He, Yan
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 25(2019)
• Page Start: 8389
• Page End: 8393
• Publication Date: 2019-05-14
• Subjects: gold -- nanocomposites -- platinum -- single-particle rotational tracking; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201901550
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: A high‐speed darkfield microscope has been developed to monitor the rapid rotation of single gold nanorods (AuNRs) and used to study the spatiotemporal heterogeneity of chemical reactions in free solution. A wide range of viscosities from 237 cP to 0.8 cP could be detected conveniently. We studied H2 O2 decomposition reactions that were catalyzed by AuNRs coated with Pt nanodots (AuNR@PtNDs) and observed two different rotational states. The two states and their transitions are related to the production and the amalgamation of O2 nanobubbles on the nanorod surface depending on H2 O2 concentration. In addition, the local fluidic environment of pure water was found to be non‐uniform in time and space. This technique could be applied to study other chemical and biochemical reactions in solution. Abstract : Tiny bubbles : Unexpected binary reaction states are observed for the decomposition of hydrogen peroxide catalyzed by the Pt nanodots decorating a gold nanorod. High‐speed darkfield microscopy and single‐nanorod rotational tracking were used to study the formation of nanobubbles on the nanorod surface, and the findings are associated with the spatiotemporal heterogeneity of the catalytic reaction in free solution.