Mechanism of optical transmittance change by NOx in CoO/SiO2 nanocomposites films
Mechanism of optical transmittance change by NOx in CoO/SiO2 nanocomposites films
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DOI：
10.1016/s0925-4005(00)00312-9
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发表时间：
2000-07
影响因子：
8.4
通讯作者：
N. Koshizaki;K. Yasumoto;T. Sasaki
中科院分区：
文献类型：
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作者：
N. Koshizaki;K. Yasumoto;T. Sasaki
利用共溅射法制备了一种由氮氧化物改变其光学透过率的CoO分散纳米复合薄膜。从SiO2靶上溅射的薄膜上的CoO颗粒在Ar气氛下显示可逆的透射率变化NO在350°C下从400至800 nm的波长范围内。在CoO/SiO2纳米复合材料中观察到直径为4-8 nm的氧化钴点。传感特性可以被认为是源于纳米结构组成的（a）功能CoO纳米粒子，改变其光学透射率，（B）纳米孔，提供气体分子的路径，和（c）透明的SiO2矩阵，使我们能够测量光学透射率。光学透射率变化的机制被推断为限制在CoO纳米颗粒中的八面体二价钴离子有效地与NO相互作用，导致参与光学吸收过程的电子位点的消耗。
CoO-dispersed nanocomposite films, changing their optical transmittance by nitrogen oxide, have been developed using the co-sputtering method. Films sputtered from a SiO2target with CoO pellets on under an Ar atmosphere showed reversible transmittance change by NO at 350°C in the wavelength range from 400 to 800 nm. Cobalt oxide dots 4–8 nm in diameter were observed in the CoO/SiO2nanocomposite. The sensing properties can be considered to be originated from nanostructures composed of (a) functional CoO nanoparticles that change their optical transmittance, (b) nanopores that provide paths for gas molecules, and (c) a transparent SiO2matrix that enables us to measure optical transmittance. A mechanism of optical transmittance change is inferred that the octahedral divalent cobalt ions confined in CoO nanoparticles effectively interact with NO, resulting in the consumption of electronic sites that are involved in the optical absorption process.