Fabrication of ZnO nanorods for gas sensing applications using hydrothermal method.
We showed well-aligned zinc oxide (ZnO) nanorod arrays synthesized using hydrothermal method at atmospheric pressure. The influence of fabrication conditions such as Zn2+/hexamethylentriamin concentration ratio, and growth temperature on the formation of ZnO nanorods was investigated. Scanning Electron Microscope (SEM) images and X-ray Diffraction (XRD) analysis were used to confirm the single crystal of ZnO nanorods, which showed wurtzite structure with growth direction of [0001] (the c-axis). Photoluminescence (PL) measurements of ZnO nanorods revealed an intense ultraviolet peak at 388.5 nm (3.19 eV) at room temperature. The results showed that the ZnO seed layers had strong influence on the growth of vertically aligned ZnO nanorods. The gas sensor based on ZnO nanorod arrays had the most selectivity with n-butanol gas (within 2 surveyed gas: ethanol and n-butanol) and showed a higher sensitivity of 222, fast response time of 15 seconds, recovery time of 110 seconds and lower operating temperature of 200-250 °C than the sensor based on the ZnO film in the same detecting conditions.
Cam Phu Thi
CP
Nguyen
Phan Phuong Ha
PP
La
Thanh Thuy
TT
Trinh
Tuan Anh Huy
TA
Le
Sungjae
S
Bong
Kyungsoo
K
Jang
Shihyun
S
Ahn
Junsin
J
Yi
D018360:Crystallography, X-Ray; D008855:Microscopy, Electron, Scanning; D043942:Nanotubes; D015034:Zinc Oxide / Q000737:chemistry*
D015034:Zinc Oxide