Photoluminescence of urea- and urea/rhodamine B-capped TiO2 nanoparticles

被引：4

作者：

Gonzalo-Juan, I. ^{[1
]}

Mace, L. ^{[1
]}

Tengeler, S. ^{[1
]}

Mosallem, A. ^{[1
]}

Nicoloso, N. ^{[1
]}

Riedel, R. ^{[1
]}

机构：

[1] Tech Univ Darmstadt, FB Mat & Geowissensch, Jovanka Bontschits Str 2, D-64287 Darmstadt, Germany

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2016年 / 177卷

关键词：

Ceramics; Organic compounds; Optical properties; Luminescence; TITANIUM-DIOXIDE; METHYL CARBAMATE; RHODAMINE-B; NITROGEN; FILMS; SOL;

D O I：

10.1016/j.matchemphys.2016.04.057

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Urea- and rhodamine B (RhB)-capped TiO2 nanoparticles (NPs) have been prepared by solvothermal synthesis and characterized by HRTEM, XRD, FTIR, XPS, optical absorption and photoemission. The urea and urea/RhB ligands are capped to the surface of the TiO2 NPs for the first time through carbamate bonding. The band gap of TiO2 is slightly reduced from 3.1 eV to 3.0 eV in the urea capped TiO2 NPs (TU) and 2.9 eV for the NPs capped with urea/RhB (TUR). The generation of new trapping states in TU and TUR at the conduction band edges (surface oxygen vacancies) has been confirmed by the Urbach law providing tail state energies of 180 meV and 270 meV, respectively. These tail states are considered to be responsible for the strong reduction of the photoluminescence at approximate to 400 nm and the increased emission at approximate to 600 nm in TU and TUR. The findings suggest that urea- and RhB-capped TiO2 NPs could have potential applications as photocatalysts, opto-electronic devices, sensors, biological labels and antibacterial agents. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：472 / 478

页数：7

共 32 条

[1] Optically active thin films deposited by plasma polymerization of dye molecules [J].

Barranco, Angel ;

Aparicio, Francisco ;

Yanguas-Gil, Angel ;

Groening, Pierangelo ;

Cotrino, Jose ;

Gonzalez-Elipe, Agustin R. .

CHEMICAL VAPOR DEPOSITION, 2007, 13 (6-7) :319-325

[2]

Beamson G, 1992, SCI ESCA300 DATABASE

[3] Variations in the Quantum Efficiency of Multiple Exciton Generation for a Series of Chemically Treated PbSe Nanocrystal Films [J].

Beard, Matthew C. ;

Midgett, Aaron G. ;

Law, Matt ;

Semonin, Octavi E. ;

Ellingson, Randy J. ;

Nozik, Arthur J. .

NANO LETTERS, 2009, 9 (02) :836-845

[4] Synthesis and applications of Rhodamine derivatives as fluorescent probes [J].

Beija, Mariana ;

Afonso, Carlos A. M. ;

Martinho, Jose M. G. .

CHEMICAL SOCIETY REVIEWS, 2009, 38 (08) :2410-2433

[5] Implications of heat treatment on the properties of a magnetic iron oxide-titanium dioxide photocatalyst [J].

Beydoun, D ;

Amal, R .

MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 2002, 94 (01) :71-81

[6]

Binyu Y., 2013, NANOTECHNOLOGY, V24

[7] Ultraslow recombination in AOT-capped TiO2 nanoparticles sensitized by protoporphyrin IX [J].

Biswas, Sudipta ;

De, Swati ;

Kathiravan, Arunkumar .

DALTON TRANSACTIONS, 2014, 43 (40) :15065-15074

[8] A physical explanation to the controversial Urbach tailing universality [J].

Boubaker, K. .

EUROPEAN PHYSICAL JOURNAL PLUS, 2011, 126 (01) :1-4

[9]

Bulkin B. J., 1981, J POLYM SCI POL LETT, V19, P520

[10] Ce-Nd codoping effect on the structural and optical properties of TiO2 nanoparticles [J].

Choudhury, Biswajit ;

Borah, Bikash ;

Choudhury, Amarjyoti .

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS, 2013, 178 (04) :239-247

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