Synthesis and H2S Sensing Properties of CuO-SnO2Core/Shell PN-Junction Nanorods
Synthesis and H2S Sensing Properties of CuO-SnO2Core/Shell PN-Junction Nanorods
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DOI：
10.1021/jp8037818
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发表时间：
2008-07
影响因子：
3.7
通讯作者：
X. Xue;Lili Xing;Yujin Chen;S. Shi;Yanguo Wang;Taihong Wang
中科院分区：
文献类型：
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作者：
X. Xue;Lili Xing;Yujin Chen;S. Shi;Yanguo Wang;Taihong Wang
一维纳米核/壳PN结由均匀包覆有P型CuO纳米颗粒（直径约4 nm）的N型SnO 2纳米棒（通过水热法合成;直径约10 nm，长度约100 nm）形成。这些PN结纳米棒实现了气体传感器，并且它们的电阻在室温下暴露于H2S时大大降低。在60 °C下对10 ppm H2S的灵敏度高达9.4 × 106。同时，该传感器对H2S具有很好的选择性。这种良好的性能可能归因于PN结的破坏和纳米结构的小尺寸效应。我们的研究结果表明，一维异质结构纳米材料是高性能气体传感器的有前途的候选人。
One-dimensional nanosized core/shell PN-junctions are formed from N-type SnO2 nanorods (synthesized via a hydrothermal method; diameter ∼10 nm, length ∼100 nm) uniformly coated with P-type CuO nanoparticles (diameter ∼4 nm). Gas sensors are realized from these PN-junction nanorods, and their resistances greatly decrease upon exposed to H2S at room temperature. The sensitivity against 10 ppm H2S at 60 °C is up to 9.4 × 106. At the same time, the sensors have very good selectivity against H2S. Such good performances are probably attributed to the destruction of PN-junctions and the small size effect of nanostructures. Our results imply that one-dimensional heterostructured nanomaterials are promising candidates for high-performance gas sensors.