二氧化钛阵列的制备及其光学性能
|
摘要
以水热法制备了由纳米棒组成的二氧化钛阵列。通过控制反应时间,对组成阵列的二氧化钛纳米棒的尺寸进行调节。利用扫描电镜和X射线衍射光谱分析了样品的形貌和晶体结构,发现将反应时间由4 h延长至8 h,二氧化钛纳米棒的直径由100 nm增大到200 nm。利用紫外-可见吸收光谱测量了样品的光吸收特性,发现了尺寸效应引起的吸收边和带隙变化,反应时间由4 h延长至8 h,样品带隙由3.09 eV变化至2.97 eV。利用荧光光谱研究样品的光致发光性能,发现了样品的近带边发光(382 nm左右)、自陷激子发光(420 nm左右)、束缚激子发光(456 nm左右)和缺陷能级发光(492 nm左右)。
TiO_2 array was synthesized by hydrothermal method. The scanning electron microscopy(SEM) and X-ray diffraction(XRD) are used to detect their morphology and structure. The average diameter of TiO_2 nanorods was increased from 100 nm to 200 nm, when the hydrothermal reaction time changed from 4 h to 8 h. UV-vis spectra were used to detect their absorption properties. The TiO_2 array with shorter diameter shows blue shift of absorption edge and broadened band gap. The band gap of TiO_2 nanorod was decreased from 3.09 eV to 2.97 eV, when the hydrothermal reaction time changed from 4 h to 8 h. Photoluminescence spectra were used to detect their optical properties. Near absorption edgee mission(about 382 nm), self-trapped exciton emission(about 420 nm), bound exciton emission(about 456 nm), and defect site emission(about 492 nm) are obtained under the examination by PL spectra.
TiO_2 array was synthesized by hydrothermal method. The scanning electron microscopy(SEM) and X-ray diffraction(XRD) are used to detect their morphology and structure. The average diameter of TiO_2 nanorods was increased from 100 nm to 200 nm, when the hydrothermal reaction time changed from 4 h to 8 h. UV-vis spectra were used to detect their absorption properties. The TiO_2 array with shorter diameter shows blue shift of absorption edge and broadened band gap. The band gap of TiO_2 nanorod was decreased from 3.09 eV to 2.97 eV, when the hydrothermal reaction time changed from 4 h to 8 h. Photoluminescence spectra were used to detect their optical properties. Near absorption edgee mission(about 382 nm), self-trapped exciton emission(about 420 nm), bound exciton emission(about 456 nm), and defect site emission(about 492 nm) are obtained under the examination by PL spectra.
引文
[1] MOR G K,VARGHESE O K,PAULOSE M,et al..A review on highly ordered,vertically oriented TiO2 nanotube arrays:fabrication,material properties,and solar energy applications [J].Solar Energy Mater.Sol.Cells,2006,90(14):2011-2075.
[2] GHICOV A,SCHMUKI P.Self-ordering electrochemistry:a review on growth and functionality of TiO2 nanotubes and other self-aligned MOx structures [J].Chem.Commun.,2009(20):2791-2808.
[3] TIAN J,ZHAO Z H,KUMAR A,et al..Recent progress in design,synthesis,and applications of one-dimensional TiO2 nanostructured surface heterostructures:a review [J].Chem.Soc.Rev.,2014,43(20):6920-6937.
[4] GRIMES C A,MOR G K.TiO2 NT Arrays Synthesis,Properties,and Applications [M].Norwell,MA:Springer,2009.
[5] OU H H,LO S L.Review of titania nanotubes synthesized via the hydrothermal treatment:fabrication,modification,and application [J].Sep.Purif.Technol.,2007,58(1):179-191.
[6] 谢世伟,肖啸,谭建军,等.基于石墨烯基电极染料敏化太阳能电池的研究进展 [J].中国光学,2014,7(1):47-56.XIE S W,XIAO X,TAN J J,et al..Recent progress in dye-sensitized solar cells using graphene-based electrodes [J].Chin.Opt.,2014,7(1):47-56.(in Chinese)
[7] 马帅,曹磊,张一梅.低温制备二氧化钛纳米薄膜及其光伏性能研究 [J].发光学报,2014,35(11):1322-1330.MA S,CAO L,ZHANG Y M.Research on the photovoltaic properties of low-temperature processed titanium oxide nanoporousmembranes [J].Chin.J.Lumin.,2014,35(11):1322-1330.(in Chinese)
[8] 孙先淼,孙琼,谢翠翠,等.实验条件对二氧化钛纳米棒形貌和光电流密度的影响 [J].发光学报,2013,34(3):257-261.SUN X M,SUN Q,XIE C C,et al..Effects of experimental conditions on the morphology and photocurrent density of TiO2 nanorods [J].Chin.J.Lumin.,2013,34(3):257-261.(in Chinese)
[9] 陈建华,龚竹青.二氧化钛半导体光催化材料离子掺杂 [M].北京:科学出版社,2006.CHEN J H,GONG Z Q.Ion Doping of Titanium Dioxide Semiconductor Photocatalytic Materials [M].Beijing:Science Press,2006.(in Chinese)
[10] 王辉利,聂铭歧,郝洪顺,等.TiO2/Eu3+下转换薄膜的制备及其在染料敏化太阳能电池中的应用 [J].发光学报,2014,35(10):1182-1187.WANG H L,NIE M Q,HAO H S,et al..Preparation of TiO2/Eu3+ down-conversion film and its application in dye-sensitized solar cell [J].Chin.J.Lumin.,2014,35(10):1182-1187.(in Chinese)
[11] ZHANG Y X,LI G H,JIN Y X,et al..Hydrothermal synthesis and photoluminescence of TiO2 nanowires [J].Chem.Phys.Lett.,2002,365(3-4):300-304.
[12] GUO Y G,HU J S,LIANG H P,et al..TiO2-based composite nanotube arrays prepared via layer-by-layer assembly [J].Adv.Funct.Mater.,2005,15(2):196-202.
[13] LEI Y,ZHANG L D,MENG G W,et al..Preparation and photoluminescence of highly ordered TiO2 nanowire arrays [J].Appl.Phys.Lett.,2001,78(8):1125-1129.
[14] BERHE S A,NAG S,MOLINETS Z,et al..Influence of seeding and bath conditions in hydrothermal growth of very thin (～20 nm) single-crystalline rutile TiO2 nanorod films [J].ACS Appl.Mater.Interfaces,2013,5(4):1181-1185.
[15] TAN Y G,SHU Z,ZHOU A J,et al..One-step synthesis of nanostructured g-C3N4/TiO2 composite for highly enhanced visible-light photocatalytic H2 evolution [J].Appl.Catal.B:Environ.,2018,230:260-268.
[16] LAI Y K,SUN L,CHEN C,et al..Optical and electrical characterization of TiO2 nanotube arrays on titanium substrate [J].Appl.Surf.Sci.,2005,252(4):1101-1106.
[17] SHANKAR K,BASHAM J I,ALLAM N K,et al..Recent advances in the use of TiO2 nanotube and nanowire arrays for oxidative photoelectro chemistry [J].J.Phys.Chem.C,2009,113(16):6327-6359.
[2] GHICOV A,SCHMUKI P.Self-ordering electrochemistry:a review on growth and functionality of TiO2 nanotubes and other self-aligned MOx structures [J].Chem.Commun.,2009(20):2791-2808.
[3] TIAN J,ZHAO Z H,KUMAR A,et al..Recent progress in design,synthesis,and applications of one-dimensional TiO2 nanostructured surface heterostructures:a review [J].Chem.Soc.Rev.,2014,43(20):6920-6937.
[4] GRIMES C A,MOR G K.TiO2 NT Arrays Synthesis,Properties,and Applications [M].Norwell,MA:Springer,2009.
[5] OU H H,LO S L.Review of titania nanotubes synthesized via the hydrothermal treatment:fabrication,modification,and application [J].Sep.Purif.Technol.,2007,58(1):179-191.
[6] 谢世伟,肖啸,谭建军,等.基于石墨烯基电极染料敏化太阳能电池的研究进展 [J].中国光学,2014,7(1):47-56.XIE S W,XIAO X,TAN J J,et al..Recent progress in dye-sensitized solar cells using graphene-based electrodes [J].Chin.Opt.,2014,7(1):47-56.(in Chinese)
[7] 马帅,曹磊,张一梅.低温制备二氧化钛纳米薄膜及其光伏性能研究 [J].发光学报,2014,35(11):1322-1330.MA S,CAO L,ZHANG Y M.Research on the photovoltaic properties of low-temperature processed titanium oxide nanoporousmembranes [J].Chin.J.Lumin.,2014,35(11):1322-1330.(in Chinese)
[8] 孙先淼,孙琼,谢翠翠,等.实验条件对二氧化钛纳米棒形貌和光电流密度的影响 [J].发光学报,2013,34(3):257-261.SUN X M,SUN Q,XIE C C,et al..Effects of experimental conditions on the morphology and photocurrent density of TiO2 nanorods [J].Chin.J.Lumin.,2013,34(3):257-261.(in Chinese)
[9] 陈建华,龚竹青.二氧化钛半导体光催化材料离子掺杂 [M].北京:科学出版社,2006.CHEN J H,GONG Z Q.Ion Doping of Titanium Dioxide Semiconductor Photocatalytic Materials [M].Beijing:Science Press,2006.(in Chinese)
[10] 王辉利,聂铭歧,郝洪顺,等.TiO2/Eu3+下转换薄膜的制备及其在染料敏化太阳能电池中的应用 [J].发光学报,2014,35(10):1182-1187.WANG H L,NIE M Q,HAO H S,et al..Preparation of TiO2/Eu3+ down-conversion film and its application in dye-sensitized solar cell [J].Chin.J.Lumin.,2014,35(10):1182-1187.(in Chinese)
[11] ZHANG Y X,LI G H,JIN Y X,et al..Hydrothermal synthesis and photoluminescence of TiO2 nanowires [J].Chem.Phys.Lett.,2002,365(3-4):300-304.
[12] GUO Y G,HU J S,LIANG H P,et al..TiO2-based composite nanotube arrays prepared via layer-by-layer assembly [J].Adv.Funct.Mater.,2005,15(2):196-202.
[13] LEI Y,ZHANG L D,MENG G W,et al..Preparation and photoluminescence of highly ordered TiO2 nanowire arrays [J].Appl.Phys.Lett.,2001,78(8):1125-1129.
[14] BERHE S A,NAG S,MOLINETS Z,et al..Influence of seeding and bath conditions in hydrothermal growth of very thin (～20 nm) single-crystalline rutile TiO2 nanorod films [J].ACS Appl.Mater.Interfaces,2013,5(4):1181-1185.
[15] TAN Y G,SHU Z,ZHOU A J,et al..One-step synthesis of nanostructured g-C3N4/TiO2 composite for highly enhanced visible-light photocatalytic H2 evolution [J].Appl.Catal.B:Environ.,2018,230:260-268.
[16] LAI Y K,SUN L,CHEN C,et al..Optical and electrical characterization of TiO2 nanotube arrays on titanium substrate [J].Appl.Surf.Sci.,2005,252(4):1101-1106.
[17] SHANKAR K,BASHAM J I,ALLAM N K,et al..Recent advances in the use of TiO2 nanotube and nanowire arrays for oxidative photoelectro chemistry [J].J.Phys.Chem.C,2009,113(16):6327-6359.