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CuO/ZnO Nanocorals synthesis via hydrothermal technique: growth mechanism and their application as Humidity Sensor

机译:水热法合成CuO / ZnO纳米管:生长机理及其作为湿度传感器的应用

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摘要

We demonstrate hydrothermal synthesis of coral-like CuO nanostructures by selective growth on ZnO nanorods (NR) at low temperatures. During the hydrothermal processing the resultant hydroxylated and eroded surface of ZnO NR becomes favorable for the CuO nanostructures growth via oriented attachments. Heterojunction p-n diodes fabricated from the CuO/ZnO nanocorals (NC) reveal stable and high rectification diode properties with a turn-on voltage ~1.52 V and negligible reverse current. The humidity sensing characteristics of the CuO/ZnO NC diodes exhibit a remarkable linear (in a semilogarithmic scale) decrease in the DC resistance by more than three orders when the relative humidity is changed from 30 – 90 %. The NC humidity sensor is also found to reveal the highest sensitivity factor ~6045 among available data for the constituent material’s and a response and recovery time of 6 s and 7 s, respectively.
机译:我们展示了通过选择性生长在低温下的ZnO纳米棒(NR)上的珊瑚状CuO纳米结构的水热合成。在水热处理过程中,所得的ZnO NR的羟基化和腐蚀表面通过定向附着对CuO纳米结构的生长变得有利。由CuO / ZnO纳米珊瑚(NC)制成的异质结p-n二极管具有稳定且高整流的二极管特性,导通电压约为1.52 V,反向电流可忽略不计。当相对湿度从30%变为90%时,CuO / ZnO NC二极管的湿度感测特性在直流电阻中呈现出显着的线性(半对数尺度)降低超过三个数量级。在成分材料的可用数据以及响应和恢复时间分别为6 s和7 s的情况下,发现NC湿度传感器的最高灵敏度系数约为6045。

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