The Effect of UV Illumination on the Room Temperature Detection of Vaporized Ammonium Nitrate by a ZnO Coated Nanospring-Based Sensor
The Effect of UV Illumination on the Room Temperature Detection of Vaporized Ammonium Nitrate by a ZnO Coated Nanospring-Based Sensor
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DOI：
10.3390/ma12020302
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发表时间：
2019-01-02
期刊：
影响因子：
3.4
通讯作者：
McIlroy, David N.
中科院分区：
文献类型：
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作者：
Bastatas, Lyndon D.;Wagle, Phadindra;McIlroy, David N.
考察了紫外光照射对硝酸铵蒸气室温电检测的影响。该传感器由包裹着氧化锌的二氧化硅纳米弹簧自组装而成。相对于黑暗条件下的操作，紫外光照射减轻了电阻的基线漂移。与黑暗条件相比，它还将传感器的基线电阻降低了25%。在高硝酸铵浓度(120ppm)下，曝光后的恢复时间在有或没有紫外线照射下几乎相同。在低硝酸铵浓度(20ppm)时，紫外线照射通过刺激分析物解吸来帮助传感器刷新，从而使传感器能够返回到其基线电阻。在黑暗条件和低硝酸铵浓度下，残留分析物会随着每次接触而积累，这会阻止传感器返回到其原始基线电阻，并随后由于永久占据吸收位置而阻碍检测。
The effect of UV illumination on the room temperature electrical detection of ammonium nitrate vapor was examined. The sensor consists of a self-assembled ensemble of silica nanosprings coated with zinc oxide. UV illumination mitigates the baseline drift of the resistance relative to operation under dark conditions. It also lowers the baseline resistance of the sensor by 25% compared to dark conditions. At high ammonium nitrate concentrations (120 ppm), the recovery time after exposure is virtually identical with or without UV illumination. At low ammonium nitrate concentrations (20 ppm), UV illumination assists with refreshing of the sensor by stimulating analyte desorption, thereby enabling the sensor to return to its baseline resistance. Under dark conditions and low ammonium nitrate concentrations, residual analyte builds up with each exposure, which inhibits the sensor from returning to its original baseline resistance and subsequently impedes sensing due to permanent occupation of absorption sites.