Arrays of ultrathin CdS nanoflakes with high-energy surface for efficient gas detection

Xiao Hua Liu, Peng Fei Yin, Sergei A. Kulinich, Yu-Zhu Zhou, Jing Mao, Tao Ling, Xi-Wen Du

Research output: Contribution to journalArticlepeer-review


It is fascinating and challenging to endow conventional materials with unprecedented properties. For instance, cadmium sulfide (CdS) is an important semiconductor with excellent light response; however, its potential in gas-sensing was underestimated owing to relatively low chemical activity and poor electrical conductivity. Herein, we demonstrate that an ideal architecture, ultrathin nanoflake arrays (NFAs), can improve significantly gas-sensing properties of CdS material. The CdS NFAs are grown directly on the interdigitated electrode to expose large surface area. Their thickness is reduced below the double Debye length of CdS, permitting to achieve a full depletion of carriers. Particularly, the prepared CdS nanoflakes are enclosed with high-energy {0001} facets exposed, which provides more active sites for gas adsorption. Moreover, the NFAs exhibit the light-trapping effect, which further enhances their gas sensitivity. As a result, the as-prepared CdS NFAs demonstrate excellent gassensing and light-response properties, thus being capable of dual gas and light detection.

Original languageEnglish
Pages (from-to)602-609
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number1
Early online date16 Dec 2016
Publication statusPublished - 11 Jan 2017


  • cadmium sulfide
  • gas sensing
  • high-energy surface
  • nanoflakes
  • ultrathin


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