Synthesis of Numerous Edge Sites in MoS2 via SiO2 Nanorods Platform for Highly Sensitive Gas Sensor

Young Seok Shim, Ki Chang Kwon, Jun Min Suh, Kyoung Soon Choi, Young Geun Song, Woonbae Sohn, Seokhoon Choi, Kootak Hong, Jong Myeong Jeon, Seung Pyo Hong, Sangtae Kim, Soo Young Kim, Chong Yun Kang, Ho Won Jang

Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)

Abstract

The utilization of edge sites in two-dimensional materials including transition-metal dichalcogenides (TMDs) is an effective strategy to realize high-performance gas sensors because of their high catalytic activity. Herein, we demonstrate a facile strategy to synthesize the numerous edge sites of vertically aligned MoS2 and larger surface area via SiO2 nanorod (NRs) platforms for highly sensitive NO2 gas sensor. The SiO2 NRs encapsulated by MoS2 film with numerous edge sites and partially vertical-aligned regions synthesized using simple thermolysis process of [(NH4)2MoS4]. Especially, the vertically aligned MoS2 prepared on 500 nm thick SiO2 NRs (500MoS2) shows approximately 90 times higher gas-sensing response to 50 ppm NO2 at room temperature than the MoS2 film prepared on flat SiO2, and the theoretical detection limit is as low as 2.3 ppb. Additionally, it shows reliable operation with reversible response to NO2 gas without degradation at an operating temperature of 100 °C. The use of the proposed facile approach to synthesize vertically aligned TMDs using nanostructured platform can be extended for various TMD-based devices including sensors, water splitting catalysts, and batteries.

Original languageEnglish
Pages (from-to)31594-31602
Number of pages9
JournalACS Applied Materials and Interfaces
Volume10
Issue number37
DOIs
Publication statusPublished - 2018 Sept 19

Bibliographical note

Funding Information:
This work was supported by the Multi-Ministry Collaborative R&D Program (Development of Techniques for Identification and Analysis of Gas Molecules to Protect Against Toxic Substances) through the National Research Foundation (NRF) of Korea funded by the KNPA, MSIT, MOTIE, ME, and NFA (2017M3D9A1073501), and the Nano-material Technology Development Programs through the NRF of Korea funded by the Ministry of Science, ICT and Future Planning (2016M3A7B4910 and 2016M3D1A1027666). J.M.S. acknowledges the Global Ph.D. Fellowship Program through the National Research Foundation of Korea funded by the Ministry of Education (2015H1A2A1033701).

Publisher Copyright:
© Copyright 2018 American Chemical Society.

Keywords

  • MoS
  • chemical vapor deposition
  • edge site
  • gas sensor
  • nanostructure platform

ASJC Scopus subject areas

  • General Materials Science

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