Visible light assisted NO2 sensing at room temperature by CdS nanoflake array

Hua Yao Li, Ji Won Yoon, Chul Soon Lee, Kyeorei Lim, Ji Wook Yoon, Jong Heun Lee

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

A Highly ordered CdS nanoflake array was fabricated by CVD, and its gas sensing characteristics were investigated. The sensor exhibited high response (resistance ratio) of 89% to 5 part per million (ppm) nitrogen dioxide (NO2) under green LED illumination (wavelength 500–540 nm, irradiance 21 W/m2) with excellent selectivity and little interference by humidity. Moreover, the sensor showed promising potential for operating under fluorescent lamp and natural solar light, which can be used for medical diagnosis and indoor/outdoor environment monitoring. This performance is attributed to the low band gap energy (2.4 eV) of CdS and the unique morphology of nanoflake array which can enhance both the light absorption and conductivity.

Original languageEnglish
Pages (from-to)2963-2970
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume255
DOIs
Publication statusPublished - 2018 Feb

Keywords

  • Cadmium sulfide
  • Gas sensor
  • Nitrogen dioxide
  • Room temperature
  • Visible light

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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