Gas sensing performance enhancement: Determining the role of active sites through colloidal lithography

The porous zinc oxide-nickel oxide (ZnO-NiO) composite nanosheets were synthesized via sputtering deposition of NiO thin film on the porous ZnO nanosheet templates. Various NiO film coverage sizes on porous ZnO nanosheet templates were achieved by changing NiO sputtering duration in this study. The microstructures of the porous ZnO-NiO composite nanosheets were investigated herein. The rugged surface feature of the porous ZnO-NiO composite nanosheets were formed and thicker NiO coverage layer narrowed the pore size on the ZnO nanosheet template. The gas sensors based on the porous ZnO-NiO composite nanosheets displayed higher sensing responses to ethanol vapor in comparison with the pristine ZnO template at the given target gas concentrations. Furthermore, the porous ZnO-NiO composite nanosheets with the suitable NiO coverage content demonstrated superior gas-sensing performance towards 50–750 ppm ethanol vapor. The observed ethanol vapor-sensing performance might be attributed to suitable ZnO/NiO heterojunction numbers and unique porous nanosheet structure with a high specific surface area, providing abundant active sites on the surface and numerous gas diffusion channels for the ethanol vapor molecules. This study demonstrated that coating of NiO on the porous ZnO nanosheet template with a suitable coverage size via sputtering deposition is a promising route to fabricate porous ZnO-NiO composite nanosheets with a high ethanol vapor sensing ability.

Download Full-text

NO2 gas sensing performance enhancement based on reduced graphene oxide decorated V2O5 thin films

Nanotechnology ◽

10.1088/1361-6528/ab0321 ◽

2019 ◽

Vol 30 (22) ◽

pp. 224001 ◽

Cited By ~ 8

Author(s):

Vijendra Singh Bhati ◽

D Sheela ◽

Basanta Roul ◽

Ramesh Raliya ◽

Pratim Biswas ◽

...

Keyword(s):

Thin Films ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Performance Enhancement ◽

Gas Sensing ◽

Reduced Graphene ◽

V2o5 Thin Films ◽

Sensing Performance

Download Full-text

Role of molar concentration in structural, optical and gas sensing performance of anatase phase TiO2 nanofilms: automated nebulizer spray pyrolysis (ANSP) technique

Applied Physics A ◽

10.1007/s00339-017-1112-1 ◽

2017 ◽

Vol 123 (7) ◽

Cited By ~ 2

Author(s):

V. Gopala Krishnan ◽

P. Elango ◽

V. Ganesan

Keyword(s):

Spray Pyrolysis ◽

Gas Sensing ◽

Anatase Phase ◽

Molar Concentration ◽

Nebulizer Spray Pyrolysis ◽

Nebulizer Spray ◽

Sensing Performance

Download Full-text

Enhanced NO2 sensing performance of S-doped biomorphic SnO2 with increased active sites and charge transfer at room temperature

Inorganic Chemistry Frontiers ◽

10.1039/d0qi00119h ◽

2020 ◽

Vol 7 (10) ◽

pp. 2031-2042

Author(s):

Wenna Li ◽

Lang He ◽

Xue Bai ◽

Lujia Liu ◽

Muhammad Ikram ◽

...

Keyword(s):

Charge Transfer ◽

Active Sites ◽

Room Temperature ◽

Gas Sensing ◽

Chemical Bonds ◽

Sensing Performance

S-Doped biomorphic SnO2 with active S-terminations and S–Sn–O chemical bonds has significantly improved gas sensing performance to NO2 at room temperature.

Download Full-text