In situ adsorption method for synthesis of binary semiconductor CdS nanocrystals inside mesoporous SBA-15

Abstract Binary semiconductor CdS nanocrystals have been prepared inside the channels of mesoporous SBA-15 using an in situ adsorption method combining a surface modification scheme and a wet impregnation technique by functionalizing the SBA-15 surface with thiol groups, adsorbing cadmium cations, and calcining in N 2 atmosphere at 300 °C. The combined results of X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) firstly reveal that CdS nanocrystals with uniform size of about 6 nm are formed and mono-dispersed inside the channels of mesoporous SBA-15. And a blue shift is observed in UV–Vis absorption spectrum and photoluminescence (PL) spectrum, indicating the quantum size effect of nanocrystalline CdS.

[1]  H. Ploehn,et al.  Aggregation Kinetics of Dendrimer-Stabilized CdS Nanoclusters , 2000 .

[2]  R. Fischer,et al.  Quantum-Confined Gallium Nitride in MCM-41 , 1999 .

[3]  Andreas Stein,et al.  Solution-phase grafting of titanium dioxide onto the pore surface of mesoporous silicates: Synthesis and structural characterization , 1997 .

[4]  Yadong Li,et al.  Nonaqueous Synthesis of CdS Nanorod Semiconductor , 1998 .

[5]  M. Pileni.  II-VI semiconductors made by soft chemistry syntheses and optical properties , 2000 .

[6]  Wen-Hau Zhang,et al.  Synthesis and Characterization of Nanosized ZnS Confined in Ordered Mesoporous Silica , 2001 .

[7]  Jian Yang,et al.  Benzene-thermal synthesis and optical properties of CdS nanocrystalline , 1998 .

[8]  B. H. Liu,et al.  Luminescence studies of CdS spherical particles via hydrothermal synthesis , 2000 .

[9]  Xintong Zhang,et al.  Size control of CdS nanocrystals in block copolymer micelle , 1999 .

[10]  T. Hirai,et al.  Size-Selective Incorporation of CdS Nanoparticles into Mesoporous Silica , 1999 .

[11]  Jian Yang,et al.  A novel solventothermal synthetic route to nanocrystalline CdE (E = S, Se, Te) and morphological control , 1998 .

[12]  Yen Wei,et al.  Controlled Synthesis of CdS Nanoparticles inside Ordered Mesoporous Silica Using Ion-Exchange Reaction , 2001 .

[13]  K. Sing.  Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendations 1984) , 1985 .

[14]  E. Barrett,et al.  (CONTRIBUTION FROM THE MULTIPLE FELLOWSHIP OF BAUGH AND SONS COMPANY, MELLOX INSTITUTE) The Determination of Pore Volume and Area Distributions in Porous Substances. I. Computations from Nitrogen Isotherms , 1951 .

[15]  R. Fischer,et al.  Confinement of CdSe Nanoparticles Inside MCM‐41 , 2000 .

[16]  E. Teller,et al.  ADSORPTION OF GASES IN MULTIMOLECULAR LAYERS , 1938 .

[17]  O. Zelaya-Ángel,et al.  Photoluminescence in cubic and hexagonal CdS films , 2001 .

[18]  H. Gies,et al.  Influence of the sorbate type on the XRD peak intensities of loaded MCM-41 , 1996 .

[19]  Wen-Hau Zhang,et al.  Preparation and characterization of ZnO clusters inside mesoporous silica , 2000 .

[20]  A. Alivisatos,et al.  Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer , 1994, Nature.

[21]  Bradley F. Chmelka,et al.  MESOCELLULAR SILICEOUS FOAMS WITH UNIFORMLY SIZED CELLS AND WINDOWS , 1999 .

[22]  Fredrickson,et al.  Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores , 1998, Science.

[23]  H. Weller.  Colloidal Semiconductor Q‐Particles: Chemistry in the Transition Region Between Solid State and Molecules , 1993 .

[24]  A Paul Alivisatos,et al.  A single-electron transistor made from a cadmium selenide nanocrystal , 1997, Nature.

[25]  Ridley,et al.  All-Inorganic Field Effect Transistors Fabricated by Printing. , 1999, Science.