A stochastic theoretical approach to study the size-dependent catalytic activity of a metal nanoparticle at the single molecule level

Literature Information

Publication Date 2017-03-03
DOI 10.1039/C6CP07895H
Impact Factor 3.676
Authors

Divya Singh, Srabanti Chaudhury


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Abstract

The catalytic activity of metal nanoparticles is intrinsically heterogeneous due to the heterogeneous distribution of surface catalytic sites and surface restructuring dynamics. Recent advances in single-molecule fluorescence spectroscopy reveal that the rates of product formation and dissociation exhibit size-dependent activities. Here we present a theoretical method to study the size-dependent catalytic activity of a metal nanoparticle using the stochastic approach based on the superposition of renewal processes. We observe that for a single nanoparticle with fewer surface-active catalytic sites, temporal fluctuations in the reaction rate, a phenomenon commonly known as dynamic disorder, are present in both the product formation and product dissociation events. The increase in the number of surface catalytic sites suppresses the effect of dynamic restructuring of the surface, thereby leading to a decrease in dynamic disorder. The proposed formalism provides a theoretical foundation to understand the size-dependent catalytic activity of metal nanoparticles at the single molecule level.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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