Thermal decomposition-assisted, aspect ratio controlled ZnO nanorods towards highly selective H2 gas detection

Thanh Thao Tran, Vishwa Bhatt, Min Jae Choi, Ha Trang Nguyen, Ankush Sharma, Manjeet Kumar, Ju Hyung Yun

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

ZnO nanostructures with various aspect ratios have been synthesized for H2 gas detection applications. The thermal-decomposition method was employed at different annealing temperatures (350, 450, and 550 °C) and its impact on various shapes/sizes of ZnO nanostructures is demonstrated. Thermal decomposition performed at 350 °C exhibited a maximum (∼6.25) aspect ratio among them. Its capability of H2 sensing was also observed to be maximum by realizing ∼483% of sensor response at 180 °C under H2 gas concentration of 80 ppm. The sensor response is ∼3 times (∼177%) and ∼9 times (∼53%) higher at ZnO nanostructure synthesized at 350 °C than at 450 °C, and 550 °C, respectively. The higher sensor response has been attributed to the increased availability of active surface area for adsorption/desorption of gas molecules. ZnO@350 nanostructure showed significantly higher selectivity towards H2 gas than other target chemical inputs. We have also studied H2-induced metallization on the surface of ZnO nanostructures which plays an important role for improving the selectivity and sensor response. This study provides insight into the role of aspect-ratio-controlled shape/sized ZnO in improving H2 gas sensing.

Original languageEnglish
Pages (from-to)768-779
Number of pages12
JournalInternational Journal of Hydrogen Energy
Volume84
DOIs
StatePublished - 26 Sep 2024

Keywords

  • H gas sensor
  • Rietveld refinement
  • Thermal decomposition method
  • ZnO nanostructure

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