Light-activated resistive ozone sensing at room temperature utilizing nanoporous In2O3 particles: Influence of particle size
Light-activated resistive ozone sensing at room temperature utilizing nanoporous In2O3 particles: Influence of particle size
复制标题
DOI：
10.1016/j.snb.2014.09.021
复制
发表时间：
2015-10
影响因子：
8.4
通讯作者：
D. Klaus;D. Klawinski;S. Amrehn;M. Tiemann;T. Wagner
中科院分区：
文献类型：
--
作者：
D. Klaus;D. Klawinski;S. Amrehn;M. Tiemann;T. Wagner
采用纳米铸造法合成的不同尺寸的有序介孔In2O3颗粒用于制备电阻式气敏层。 LED 光激活（蓝光，460 nm）可实现室温臭氧传感。除了包含小颗粒（直径约 170 nm）或大颗粒（约 870 nm）的传感层的基线电阻差异外，还观察到响应幅度和响应时间常数的差异。对于小颗粒，可以更快地实现信号稳定。此外，传感器显示出针对低臭氧浓度的与颗粒尺寸相关的反应阈值。较大颗粒对 50 ppb 臭氧的响应可以忽略不计，而小颗粒传感器则观察到显着响应。提出了一个基于几何特性和耗尽层形成的简单模型，解释了观察到的行为。
Ordered mesoporous In2O3particles of variable size synthesized by the nanocasting method are used for preparation of resistive gas-sensing layers. Light activation by a LED (blue light, 460 nm) permits room-temperature ozone sensing. Apart from differences in base-line resistance in sensing layers containing small (diameter approx. 170 nm) or large particles (approx. 870 nm), differences in the response amplitude and response time constant are also observed. Signal stabilization is achieved faster for small particles. In addition, sensors show a particle size-dependent reaction threshold for low ozone concentration. Larger particles show negligible response to 50 ppb ozone whereas a significant response is observed for the small-particle sensors. A simple model based on geometrical properties and formation of depletion layers explaining the observed behavior is presented.