Cd doped ZnO nanorods for efficient room temperature NH3 sensing

被引：24

作者：

Brahma, Sanjaya ^{[1
,2
]}

Huang, P. C. ^{[3
]}

Mwakikunga, B. W. ^{[4
,5
]}

Saasa, V. ^{[4
]}

Akande, A. A. ^{[7
]}

Huang, Jow-Lay ^{[1
,2
,6
]}

Liu, Chuan-Pu ^{[1
,2
,6
]}

机构：

[1] Natl Cheng Kung Univ, Dept Mat Sci & Engn, Tainan 701, Taiwan

[2] Natl Cheng Kung Univ, Hierarch Green Energy Mat Hi GEM Res Ctr, Tainan 701, Taiwan

[3] Natl Synchrotron Radiat Res Ctr, X ray Scattering Grp, Hsinchu 300, Taiwan

[4] Natl Ctr Nanostruct Mat, CSIR, DST, Council Scient & Ind Res, ZA-0001 Pretoria, South Africa

[5] Tshwane Univ Technol, Dept Phys, Arcadia Campus, Cnr Nelson Mandela St & Church St, ZA-0001 Pretoria, South Africa

[6] Natl Cheng Kung Univ, Ctr Micro Nano Sci & Technol, Tainan 701, Taiwan

[7] CSIR NextGen Enterprises & Inst Cluster, Res Ctr EDT4IR, POB 395, ZA-0001 Pretoria, South Africa

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2023年 / 294卷

关键词：

Gas sensor; Room temperatureNH3 sensor; Doped ZnO nanorods; Hydrothermal method; GAS SENSOR; AMMONIA;

D O I：

10.1016/j.matchemphys.2022.127053

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We demonstrate room temperature (25 degrees C) and low temperature (<= 100 degrees C) NH3 gas sensing properties of Cd-doped ZnO nanorods (NRs) synthesized by a low temperature (90 degrees C) hydrothermal method. Although, the Cd concentration in the growth solution was varied over a large range from 0 to 80 mol %, the maximum estimated Cd doping concentration in ZnO NRs was 0.5 at % (80 mol %). Structural analysis confirmed the successful doping of Cd in ZnO and microstructure investigation revealed the presence of single nanorod and flower like nanorods in the same ensemble whose dimensions reduced with the Cd doping concentration. Photo-luminescence and Raman spectra analyses confirmed the increase of defect concentrations in ZnO NRs by Cd doping thereby enhancing the overall gas sensing. In response to NH3, the nanostructure sensors exhibited a gradual increase in the sensitivity with the Cd doping concentration where the 0.5 at % Cd-doped ZnO NRs showed the highest sensitivity with an enhancement of-9% (at 60 ppm NH3) as compared to the un-doped ZnO. The sensitivity continued to rise with the increase of temperature from 110% (25 degrees C), 120% (50 degrees C), 170% (75 degrees C) to 243% (100 degrees C) indicating a gigantic enhancement of-133% at 100 degrees C from 25 degrees C. The Cd-doped ZnO NRs also revealed superior specificity of detecting NH3 over NO2, and H2S even at room temperature.

引用

页数：10

共 30 条

[1] Gas sensing properties of Cd-doped ZnO nanofibers synthesized by the electrospinning method [J].