Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 321, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.128461
Keywords
TiO2/ZnCo2O4; Porous nanorod; HCHO; TEA; Gas sensor
Funding
- National Natural Science Foundation of China [U1704255, U1404613]
- Program for Science & Technology Innovation Talents in Universities of Henan Province [18HASTIT010]
- Foundation of Henan Scientific and Technology key project [182102310892]
- Education Department Natural Science Foundation of fund Henan province [16A150051]
- Program for Innovative Research Team of Henan Polytechnic University [T2019-1]
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Selective detection of different gases on a sensor based on metal oxide semiconductor (MOS) is greatly desired but still remains a challenge. Herein, we demonstrated a strategy to realize highly sensitive and selective detection of formaldehyde (HCHO) and triethylamine (TEA) by using TiO2-decorated ZnCo2O4 porous nanorods (PNRs) as sensing material. The TiO2/ZnCo2O4 PNRs were prepared via a facile dual-oxalate sacrificial template method, in which ZnCo2O4/ZnCo2O4 solid nanorods were synthesized in advance through a simple room temperature co-precipitation method and then applied as sacrificial templates for TiO2/ZnCo2O4 PNRs by immersing them in C10H14O5Ti ethanol solution before calcination. The prepared TiO2/ZnCo2O4 PNRs feature an assembly of randomly stacked nanoparticles with the size about 20 nm. In comparison with pure ZnCo2O4 PNRs, the TiO2/ZnCo2O4 PNRs showed an improved gas sensitivity. More importantly, the sensor based on 4TZCO (TiO2/ZnCo2O4 PNRs with optimized TiO2 content of 4 wt%) could realize selective detection of HCHO and TEA at ppm level by controlling the working temperature at 130 degrees C and 220 degrees C, respectively. The ZnCo2O4-TiO2 p-n heterostructure-related gas sensing mechanism was discussed.
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