journal article·2025-07-15

Atomic-Scale Control and In Situ Raman Probing of Hot Carrier Transport in Two-Dimensional Heterojunctions

Jing-Liang Yang, Hong-Jia Wang, Xia-Guang Zhang, Gaoxiang Lin, Huijie Liu, Jing-Yu Wang, Jingyi Hu, Yanfeng Zhang, Xiaosi Qi, Weiwei Cai, Ye Yang, Hua Zhang, Jian-Feng Li

ACS Nano· Volume 19· Issue 27
Publisher page

Abstract

Chemical reactions triggered by plasmonic hot carriers attract growing attention due to their high activity and widely adjustable selectivity. However, precise control of hot carrier behaviors and catalytic reactions driven by them on the subnanometer scale remains challenging. Herein, the transportation of plasmonic hot carriers in two-dimensional (2D) van der Waals (vdW) heterojunctions consisting of graphene and MoS 2, as well as its influence on photocatalytic reactions, has been in situ monitored by surface-enhanced Raman spectroscopy (SERS) with atomic layer accuracy. Direct spectral results prove that when the MoS 2 layer gradually moves closer to the top Au nanoparticles (NPs), the reduction reaction efficiency induced by hot electrons improves, while the oxidation process induced by hot holes is inhibited and vice versa. This originates from the redistribution of electromagnetic fields in the plasmonic nanogap as well as the change in the hot carrier generation and transfer efficiency with different MoS 2 /graphene vdW heterojunction stacking modes, as revealed by time-resolved transient absorption spectra (TAS), electromagnetic field simulations, and density functional theory (DFT). This work provides valuable insights to deepen the understanding of vdW heterojunction-modulated hot carrier behaviors and reveals the importance of precise photocatalyst design.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · Quantum Dots Synthesis And Properties · Nanowire Synthesis and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

College of Physics, Guizhou Province Key Laboratory for Photoelectrics Technology and Application

Guizhou University

College of Materials, College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Energy, College of Physics and Technology, Fujian Key Laboratory of Advanced Materials

Xiamen University

Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering

Henan Normal University

School of Physics and Information Engineering

Shanxi Normal University

Department of Materials Science and Engineering, College of Engineering

Peking University

College of Chemistry, Chemical Engineering and Environment

Minnan Normal University

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Scientific and Technological Project of Yunnan Precious Metals Laboratory · Natural Science Special Research Foundation of Guizhou University · State Key Laboratory of Fine Chemicals, Dalian University of Technology

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