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活性粒子吸附对ZnO纳米粒子表面光伏特性的影响

Influence of Active Particle Adsorption on Surface Photovoltage Properties of ZnO Nanoparticle
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摘要 Surface photovoltage spectrum(SPS), field-induced surface photovoltage spectrum(FISPS) and gas probe techniques are used together to study surface photovoltage(SPV) property of ZnO nanoparticles. The SPS of ZnO nanoparticles consists of two parts, band-to-band transition(P1,P2) and surface states transition(P3). The result shows that the SPV response is mostly attributed to the built-in field formed by active adsorbates, most of which is O 2. Competitive adsorption of O 2 and H 2O exists on ZnO surface. They play different roles in the influence on SPS. The Adsorption of O 2 weakens P3, whereas H 2O enhances P3. And the velocity of adsorption and desorption of O 2 on the surface is significantly faster than H 2O. The adsorption and desorption of H 2O may be correlated with the adjustment of surface structure. Surface photovoltage spectrum(SPS), field-induced surface photovoltage spectrum(FISPS) and gas probe techniques are used together to study surface photovoltage(SPV) property of ZnO nanoparticles. The SPS of ZnO nanoparticles consists of two parts, band-to-band transition(P1,P2) and surface states transition(P3). The result shows that the SPV response is mostly attributed to the built-in field formed by active adsorbates, most of which is O 2. Competitive adsorption of O 2 and H 2O exists on ZnO surface. They play different roles in the influence on SPS. The Adsorption of O 2 weakens P3, whereas H 2O enhances P3. And the velocity of adsorption and desorption of O 2 on the surface is significantly faster than H 2O. The adsorption and desorption of H 2O may be correlated with the adjustment of surface structure.
出处 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2004年第12期2353-2355,共3页 Chemical Journal of Chinese Universities
基金 国家自然科学基金 (批准号 :2 0 2 73 0 2 7) 教育部博士学科点基金 (批准号 :0 2 0 183 0 0 8) 吉林大学纳米重点科研基金资助
关键词 ZNO纳米粒子 光电气敏 表面光伏 表面态 ZnO nanoparticles Photo-electric gas-sensitivity Surface photovoltage Surface state
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