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2020 Vol.30, Issue 8 Preview Page
Effect of Al Doping on the Properties of ZnO Nanorods Synthesized by Hydrothermal Growth for Gas Sensor Applications
Vibha Srivastava
,
Eadi Sunil Babu
,
Soon–Ku Hong†
Department of Materials Science Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
†Corresponding author E-Mail : soonku@cnu.ac.kr (S. K. Hong, Chungnam Nat‘l Univ.)
August 2020. pp. 399-405
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Abstract

In the present investigation we show the effect of Al doping on the length, size, shape, morphology, and sensing property of ZnO nanorods. Effect of Al doping ultimately leads to tuning of electrical and optical properties of ZnO nanorods. Undoped and Al-doped well aligned ZnO nanorods are grown on sputtered ZnO/SiO2/Si (100) pre-grown seed layer substrates by hydrothermal method. The molar ratio of dopant (aluminium nitrate) in the solution, [Al/Zn], is varied from 0.1 % to 3 %. To extract structural and microstructural information we employ field emission scanning electron microscopy and X-ray diffraction techniques. The prepared ZnO nanorods show preferred orientation of ZnO <0001> and are well aligned vertically. The effects of Al doping on the electrical and optical properties are observed by Hall measurement and photoluminescence spectroscopy, respectively, at room temperature. We observe that the diameter and resistivity of the nanorods reach their lowest levels, the carrier concentration becomes high, and emission peak tends to approach the band edge emission of ZnO around 0.5% of Al doping. Sensing behavior of the grown ZnO nanorod samples is tested for H2 gas. The 0.5 mol% Al-doped sample shows highest sensitivity values of ~ 60% at 250 °C and ~ 50% at 220 °C.

Keywords
hydrothermal growth
oxide
zinc compounds
gas sensor
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 30
  • No :8
  • Pages :399-405
  • Received Date : 2020-04-29
  • Revised Date : 2020-07-16
  • Accepted Date : 2020-07-20
  • DOI :https://doi.org/10.3740/MRSK.2020.30.8.399
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