Surface photovoltage phase spectroscopy study of the photo-induced charge carrier properties of TiO2 nanotube arrays
By using the surface photovoltage （SPV） technique based on a lock-in amplifier, surface states located 3.1 eV below the conduction band of TiO2 have been detected in TiO2 nanotube arrays prepared by anodization of titanium foil in fluoride-based ethylene glycol solution. The photo-induced charge tra...
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| Veröffentlicht in: | Science China. Chemistry 2012-02, Vol.55 (2), p.229-234 |
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| container_title | Science China. Chemistry |
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| creator | Chen, LiPing Xie, TengFeng Wang, DeJun Fan, ZhiYong Jiang, TengFei |
| description | By using the surface photovoltage （SPV） technique based on a lock-in amplifier, surface states located 3.1 eV below the conduction band of TiO2 have been detected in TiO2 nanotube arrays prepared by anodization of titanium foil in fluoride-based ethylene glycol solution. The photo-induced charge transportation behavior of TiO2 nanotube arrays was also studied by quali- tatively analyzing their SPV phase spectra measured under different external bias. When a negative bias was applied, carriers excited from surface states have the same transportation properties as those excited from the valence band; in contrast, when a positive bias was applied, these two kinds of photo-excited carriers exhibit different transportation behavior. |
| doi_str_mv | 10.1007/s11426-011-4335-6 |
| format | Article |
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The photo-induced charge transportation behavior of TiO2 nanotube arrays was also studied by quali- tatively analyzing their SPV phase spectra measured under different external bias. When a negative bias was applied, carriers excited from surface states have the same transportation properties as those excited from the valence band; in contrast, when a positive bias was applied, these two kinds of photo-excited carriers exhibit different transportation behavior.</description><identifier>ISSN: 1674-7291</identifier><identifier>EISSN: 1869-1870</identifier><identifier>DOI: 10.1007/s11426-011-4335-6</identifier><language>eng</language><publisher>Heidelberg: SP Science China Press</publisher><subject>Arrays ; Bias ; Charge transport ; Chemistry ; Chemistry and Materials Science ; Chemistry/Food Science ; Conduction bands ; Current carriers ; Ethylene glycol ; Lock in amplifiers ; Metal foils ; Nanotubes ; Titanium dioxide ; Valence band ; 二氧化钛 ; 光诱导 ; 光谱 ; 特性 ; 电荷载体 ; 相位谱 ; 纳米管阵列 ; 表面光电压</subject><ispartof>Science China. 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China Chem</stitle><addtitle>SCIENCE CHINA Chemistry</addtitle><date>2012-02-01</date><risdate>2012</risdate><volume>55</volume><issue>2</issue><spage>229</spage><epage>234</epage><pages>229-234</pages><issn>1674-7291</issn><eissn>1869-1870</eissn><abstract>By using the surface photovoltage （SPV） technique based on a lock-in amplifier, surface states located 3.1 eV below the conduction band of TiO2 have been detected in TiO2 nanotube arrays prepared by anodization of titanium foil in fluoride-based ethylene glycol solution. The photo-induced charge transportation behavior of TiO2 nanotube arrays was also studied by quali- tatively analyzing their SPV phase spectra measured under different external bias. 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| subjects | Arrays Bias Charge transport Chemistry Chemistry and Materials Science Chemistry/Food Science Conduction bands Current carriers Ethylene glycol Lock in amplifiers Metal foils Nanotubes Titanium dioxide Valence band 二氧化钛 光诱导 光谱 特性 电荷载体 相位谱 纳米管阵列 表面光电压 |
| title | Surface photovoltage phase spectroscopy study of the photo-induced charge carrier properties of TiO2 nanotube arrays |
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