Synergistic Effects of a Combination of Cr2O3-Functionalization and UV-Irradiation Techniques on the Ethanol Gas Sensing Performance of ZnO Nanorod Gas Sensors
Synergistic Effects of a Combination of Cr2O3-Functionalization and UV-Irradiation Techniques on the Ethanol Gas Sensing Performance of ZnO Nanorod Gas Sensors
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DOI：
10.1021/acsami.5b11485
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发表时间：
2016-02-03
影响因子：
9.5
通讯作者：
Lee, Chongmu
中科院分区：
文献类型：
--
作者：
Park, Sunghoon;Sun, Gun-Joo;Lee, Chongmu
结合两种或两种以上技术对纳米结构传感器传感性能影响的研究很少。采用碳热合成的方法，将氧化锌和石墨粉的混合物进行热蒸发，然后采用溶剂热法进行cr2o3功能化，制备了cr2o3功能化的ZnO纳米棒。研究了紫外照射下多网络原始和cr2o3功能化ZnO纳米棒传感器的乙醇气敏性能，以确定Cr2O3-ZnO异质结构形成和紫外照射对ZnO纳米棒气敏性能的影响。室温下，在2.2 mW/cm(2)的紫外光照下，原始和cr2o3功能化ZnO纳米棒传感器对200ppm乙醇的响应分别提高了3.8倍和7.7倍。在相同乙醇浓度下，cr2o3功能化ZnO纳米棒传感器比原始ZnO纳米棒传感器具有更快的响应/恢复速度和更好的选择性。这表明异质结构的形成和紫外线照射对传感器的气敏性能有协同效应。这种协同效应可能归因于Cr2O3对乙醇氧化的催化活性，以及由于Cr2O3纳米颗粒存在于Cr2O3功能化的ZnO纳米棒传感器中，在紫外线照射下乙醇的吸附和解吸增加了导电通道宽度的变化。
There have been very few studies on the effects of combining two or more techniques on the sensing performance of nanostructured sensors. Cr2O3-functionalized ZnO nanorods were synthesized using carbothermal synthesis involving the thermal evaporation of a mixture of ZnO and graphite powders followed by a solvothermal process for Cr2O3-functionalization. The ethanol gas sensing properties of multinetworked pristine and Cr2O3-functionalized ZnO nanorod sensors under UV illumination were examined to determine the effects of combining Cr2O3-ZnO heterostructure formation and UV irradiation on the gas sensing properties of ZnO nanorods. The responses of the pristine and Cr2O3-functionalized ZnO nanorod sensors to 200 ppm of ethanol at room temperature by UV illumination at 2.2 mW/cm(2) were increased by 3.8 and 7.7 times, respectively. The Cr2O3-functionalized ZnO nanorod sensor also showed faster response/recovery and better selectivity than those of the pristine ZnO nanorod sensor at the same ethanol concentration. This result suggests that a combination heterostructure formation and UV irradiation had a synergistic effect on the gas-sensing properties of the sensor. The synergistic effect might be attributed to the catalytic activity of Cr2O3 for ethanol oxidation as well as to the increased change in conduction channel width accompanying adsorption and desorption of ethanol under UV illumination due to the presence of Cr2O3 nanoparticles in the Cr2O3-functionalized ZnO nanorod sensor.