Room-temperature ammonia gas sensing via Au nanoparticle-decorated TiO2 nanosheets

Jeong Yun Hwang, Yerin Lee, Gyu Ho Lee, Seung Yong Lee, Hyun Sik Kim, Sang il Kim, Hee Jung Park, Sun Jae Kim, Beom Zoo Lee, Myung Sik Choi, Changhyun Jin, Kyu Hyoung Lee

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

A high-performance gas sensor operating at room temperature is always favourable since it simplifies the device fabrication and lowers the operating power by eliminating a heater. Herein, we fabricated the ammonia (NH3) gas sensor by using Au nanoparticle-decorated TiO2 nanosheets, which were synthesized via two distinct processes: (1) preparation of monolayer TiO2 nanosheets through flux growth and a subsequent chemical exfoliation and (2) decoration of Au nanoparticles on the TiO2 nanosheets via hydrothermal method. Based on the morphological, compositional, crystallographic, and surface characteristics of this low-dimensional nano-heterostructured material, its temperature- and concentration-dependent NH3 gas-sensing properties were investigated. A high response of ~ 2.8 was obtained at room temperature under 20 ppm NH3 gas concentration by decorating Au nanoparticles onto the surface of TiO2 nanosheets, which generated oxygen defects and induced spillover effect as well.

Original languageEnglish
Article number47
JournalDiscover Nano
Volume18
Issue number1
DOIs
StatePublished - Dec 2023

Keywords

  • Ammonia
  • Au nanoparticle
  • Gas sensor
  • Room temperature
  • TiO nanosheet

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