银纳米颗粒修饰TiO_2薄膜的结构,光学及光催化性能
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摘要
采用电子束沉积技术在石英玻璃、硅片基板上沉积了TiO_2薄膜,利用热蒸发技术在TiO_2薄膜表面沉积了不同厚度的Ag膜,研究了Ag膜厚度对TiO_2薄膜结构、形貌、光学和光催化性能的影响。利用紫外-可见分光光度计(UV-VIS)、X射线衍射仪(XRD)、冷场发射电子显微镜(SEM)对沉积后的薄膜分别进行光学、结构、形貌分析。利用能谱仪测定了元素成分及含量。用光催化降解亚甲基橙(MO)的速率评价了合成的Ag-TiO_2的光催化性能。结果表明:Ag纳米粒子在TiO_2表面均匀分布;制备的Ag修饰多孔TiO_2纳米薄膜具有优异的光催化性能。测试结果表明:在250℃下制备的TiO_2薄膜为无定形结构;随着Ag膜厚度的增加,样品的光催化活性提高。当Ag膜厚度为3.7 nm时,光催化活性最高;与纯TiO_2相比,Ag-TiO_2具有更高的光催化活性。
TiO_2 films were deposited employing electron beam evaporation technique on fused silica and Si substrates and silver nanoparticles with different thicknesses were deposited on TiO_2 films surface by thermal evaporation technique.The effect of Ag thickness on the structural,morphological,optical and photocatalytic properties of the nanocomposite thin films was investigated,and these properties were obtained by UV-Vis spectrophotometer,X-ray diffraction(XRD),scanning electronmicroscopy(SEM),respectively.The composition and content of elements were determined by energy dispersive spectrometer.The photocatalytic performances of the as-synthesized Ag-TiO_2 were evaluated in terms of their photodegradation rate of methyl orange(MO) in an aqueous solution under light.The results show that the Ag nanoparticles are well dispersed on porous TiO_2 surface.The as-prepared Ag-decorated porous TiO_2 films exhibits excellent photocatalytic properties.The results indicate that the as-deposited Ag-TiO_2 thin films are amorphous.It indicates that photocatalytic activity of the samples is enhanced with the thickness of Ag increased until reach to 3.7 nm.The Ag-TiO_2 films show an enhanced photocatalytic activity compared with pure TiO_2 films.
TiO_2 films were deposited employing electron beam evaporation technique on fused silica and Si substrates and silver nanoparticles with different thicknesses were deposited on TiO_2 films surface by thermal evaporation technique.The effect of Ag thickness on the structural,morphological,optical and photocatalytic properties of the nanocomposite thin films was investigated,and these properties were obtained by UV-Vis spectrophotometer,X-ray diffraction(XRD),scanning electronmicroscopy(SEM),respectively.The composition and content of elements were determined by energy dispersive spectrometer.The photocatalytic performances of the as-synthesized Ag-TiO_2 were evaluated in terms of their photodegradation rate of methyl orange(MO) in an aqueous solution under light.The results show that the Ag nanoparticles are well dispersed on porous TiO_2 surface.The as-prepared Ag-decorated porous TiO_2 films exhibits excellent photocatalytic properties.The results indicate that the as-deposited Ag-TiO_2 thin films are amorphous.It indicates that photocatalytic activity of the samples is enhanced with the thickness of Ag increased until reach to 3.7 nm.The Ag-TiO_2 films show an enhanced photocatalytic activity compared with pure TiO_2 films.
引文
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[19] Guitoume D,Achour S,Sobti N,et al.Structural,optical and photoelectrochemical properties of TiO2 films decorated with plasmonic silver nanoparticles[J].2018,154:182-191.
[20] Liao Yan-biao.Polarization optics[M].Beijing:Science and Technology of China Press,2003,6.廖延彪.偏振光学[M].北京:科学技术出版社,2003,6.
[2] Rodrigues M S,Costa D,Domingues R P,et al.Optimization of nanocomposite Au/TiO2 thin films towards LSPR optical-sensing[J].Applied Surface Science,2018,438:74-83.
[3] Madhavi V,Kondaiah P,Rao Mohan G.Influence of silver nanoparticles on titanium oxide and nitrogen doped titanium oxide thin films for sun light photocatalysis[J].Applied Surface Science,2018,436:708-719.
[4] Shetti N P,Nayak D S,Malode S J,et al.An electrochemical sensor for clozapine at ruthenium doped TiO2 nanoparticles modified electrode[J].Sensors & Actuators B Chemical,2017,247:858-867.
[5] Dissanayake M A K L,Kumari J M K W,Senadeera G K R,et al.A novel multilayered photoelectrode with nitrogen doped TiO2 for efficiency enhancement in dye sensitized solar cells[J].Journal of Photochemistry and Photobiology A:Chemistry,2017,349:63-72.
[6] Hanaor D A H,Sorrell C C.Review of the anatase to rutile phase transformation[J].Journal of Materials Science,2011,46(4):855-874.
[7] Jaiswal R,Bharambe J,Patel N,et al.Copper and Nitrogen co-doped TiO2 photocatalyst with enhanced optical absorption and catalytic activity[J].Applied Catalysis B:Environmental,2015,(168-169):333-341.
[8] Jin Cui,Ying Dai,Wei Wei,et al.Effects of single metal atom (Pt,Pd,Rh and Ru) adsorption on the photocatalytic properties of anatase TiO2[J].Applied Surface Science,2017,426:639-646.
[9] Ma J,Guo X,Ge H,et al.Seed-mediated photodeposition route to Ag-decorated SiO2@TiO2 microspheres with ideal core-shell structure and enhanced photocatalytic activity[J].Applied Surface Science,2018,434:1007-1014.
[10] HAO Dian-zhong ,HAN Pei-gao,NIU Ming-sheng.Effects of films thickness on optical and photocatalytic ability of Ag-TiO2 thin films[J].Journal of Optoelectrics·Laser,2018,29(1):52-56.郝殿中,韩培高,牛明生.膜厚对Ag-TiO2薄膜光学性能和光催化性能影响的研究[J].光电子·激光,2018,29(1):52-56.
[11] HAO Dian-zhong,HAN Pei-gao,NIU Ming-sheng.Effect of Ag concentration on the optical performance and photocalytic ability of TiO2 thin films[J].Journal of Optoelectrics·Laser,2018,29(7):723-728.郝殿中,韩培高,牛明生.Ag含量对TiO2薄膜光学性能和光催化性能影响[J].光电子·激光,2018,29(7):723-728.
[12] Dai H,Sun Y,Ni P,et al.Three-dimensional TiO2 supported silver nanoparticles as sensitive and UV-cleanable substrate for surface enhanced Raman scattering[J].Sensors & Actuators B Chemical,2017,242:260-268.
[13] Ba?uszyńska K,Kisielewska A,Stanek K S,et al.Investigation of the photodecomposition process of thin layers of arachidic acid on titanium dioxide coatings modified by silver nanoparticles observed in situ by atomic force microscopy[J].Journal of Photochemistry & Photobiology A:Chemistry,2017,335:239-247.
[14] HAO Dian-zhong,ZHANG Xia,HAN Pei-gao,et al.Effect of air annealing on optical performance and photocatalytic performance of electron beam evaporated Ag/TiO2 thin films[J].Journal of Optoelectrics·Laser,2018,29(9):969-974.郝殿中,张霞,韩培高,等.退火温度对电子束沉积Ag/TiO2薄膜光学性质和光催化性能的影响[J].光电子·激光,2018,29(9):969-974.
[15] Messih M F A,Ahmed M A,Soltan A,et al.Facile approach for homogeneous dispersion of metallic silver nanoparticles on the surface of mesoporous titania for photocatalytic degradation of methylene blue and indigo carmine dyes[J].Journal of Photochemistry & Photobiology A:Chemistry,2017,335:40-51.
[16] Fu Xin,Pan Lu-jun,Li Shuai,et al.Controlled preparation of Ag nanoparticle films by a modified photocatalytic method on TiO2 films with Ag seeds for surface-enhanced Raman scattering[J].Applied Surface Science,2016,363:412-420.
[17] WANG Xin,ZHAO Zhe,OU Ding-rong,et al.Highly active Ag clusters stabilized on TiO2 nanocrystals for catalytic reduction of p-nitrophenol [J].Applied Surface Science,2016,385:445-452.
[18] HOU Ya-qi,ZHUANG Da-ming,ZHANG Gong,et al.Photocatalytic degradation properties of Ag /TiO2 composite f ilms prepared by magnetron sputtering[J].J Tsingh ua Univ (Sci& Tech),2004,44(5):589-592.侯亚奇,庄大明,张弓,等.磁控溅射制备Ag/TiO2复合薄膜的光催化降解性能[J].清华大学学报(自然科学版),2004,44(5):589-592.
[19] Guitoume D,Achour S,Sobti N,et al.Structural,optical and photoelectrochemical properties of TiO2 films decorated with plasmonic silver nanoparticles[J].2018,154:182-191.
[20] Liao Yan-biao.Polarization optics[M].Beijing:Science and Technology of China Press,2003,6.廖延彪.偏振光学[M].北京:科学技术出版社,2003,6.