ppb-Level Selective Hydrogen Gas Detection of Pd-Functionalized In2O3-Loaded ZnO Nanofiber Gas Sensors
ppb-Level Selective Hydrogen Gas Detection of Pd-Functionalized In2O3-Loaded ZnO Nanofiber Gas Sensors
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DOI：
10.3390/s19194276
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发表时间：
2019-10-01
期刊：
影响因子：
3.9
通讯作者：
Kim, Sang Sub
中科院分区：
文献类型：
--
作者：
Lee, Jae-Hyoung;Kim, Jae-Hun;Kim, Sang Sub
采用静电纺丝和紫外光照射的方法制备了Pd纳米粒子功能化的xIn（2）O（3）（x = 0.05，0.1和0.15）负载ZnO纳米纤维，并对其氢气传感性能进行了评价。形态学和化学分析揭示了所需的形态和合成的纳米纤维的化学组成。最佳的气体传感器，即Pd官能化的，0.1In（2）O（3）负载的ZnO纳米纤维，在350 ℃下对172-50 ppb的氢气显示出非常强的响应，这被认为是最佳的传感温度。此外，由于对CO和NO2气体的低得多的响应，气体传感器显示出对氢气的优异选择性。这种增强的气体响应归因于Pd对氢气的优异催化活性，以及Pd/ZnO和In 2 O3/ZnO异质结、ZnO-ZnO同质结以及PdHx的形成。总体而言，高灵敏度和选择性的氢气传感器可以产生基于一个简单的方法，使用协同效应，从Pd功能化和In 2 O3负载在ZnO纳米纤维。
Pd nanoparticle-functionalized, xIn(2)O(3) (x = 0.05, 0.1, and 0.15)-loaded ZnO nanofibers were synthesized by an electrospinning and ultraviolet (UV) irradiation method and assessed for their hydrogen gas sensing properties. Morphological and chemical analyses revealed the desired morphology and chemical composition of the synthesized nanofibers. The optimal gas sensor namely Pd-functionalized, 0.1In(2)O(3)-loaded ZnO nanofibers showed a very strong response to 172-50 ppb hydrogen gas at 350 degrees C, which is regarded as the optimal sensing temperature. Furthermore, the gas sensors showed excellent selectivity to hydrogen gas due to the much lower response to CO and NO2 gases. The enhanced gas response was attributed to the excellent catalytic activity of Pd to hydrogen gas, and the formation of Pd/ZnO and In2O3/ZnO heterojunctions, ZnO-ZnO homojunction, as well as the formation of PdHx. Overall, highly sensitive and selective hydrogen gas sensors can be produced based on a simple methodology using a synergistic effect from Pd functionalization and In2O3 loading in ZnO nanofibers.