2023年第70回応用物理学会春季学術講演会

講演情報

一般セッション(口頭講演)

9 応用物性 » 9.2 ナノ粒子・ナノワイヤ・ナノシート

[17p-D221-1~13] 9.2 ナノ粒子・ナノワイヤ・ナノシート

2023年3月17日(金) 13:30 〜 17:00 D221 (11号館)

深田 直樹(物材機構)、伊藤 健(関西大)、高橋 綱己(東大)

14:30 〜 14:45

[17p-D221-5] Gas Sensing Mechanism in Au@SnO2 Nanoparticle-Based Chemiresistor Studied by in-situ Surface-Enhanced Raman Spectroscopy

〇(P)Haoming Bao1、Kenta Motobayashi1、Katsuyoshi Ikeda1 (1.Nagoya Institute of Technology)

キーワード:In-situ Surface-Enhanced Raman Spectroscopy (SERS), Au@SnO2 Nanoparticle-based Gas Sensing, Mars-Van-Krevelen Mechanism

Understanding the mechanisms can provide a fundamental guideline for designing higher-performance gas sensors. However, the mechanisms are still under controversy between Langmuir-Hinshelwood and Mars-van Krevelen (MvK) models. This work constructs a sensitive in-situ surface-enhanced Raman spectroscopy (SERS) tracing platform based on Au@SnO2 NPs (with SERS and gas sensing dual functions) for tracing the ethanol gas sensing. The observed evolutions of Raman bands [including the weakened band associated with bridging OVs, stable band related to the in-plane OVs, and some strengthened bands of IR-active modes] in the in-situ SERS suggest that the sensing follows a Mars-Van-Krevelen (MvK) mechanism, in which the bridging lattice oxygen is selectively reacted to from oxygen vacancies (OVs). This work presents an in-situ tracking strategy for gas sensing and confirms the MvK mechanism in Au@SnO2 NP-based gas sensing.