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CdS nanoparticle sensitized titanium dioxide decorated graphene for enhancing visible light induced photoanode

Yousefzadeh, S ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.apsusc.2014.09.167
  3. Abstract:
  4. CdS/TiO2/graphene (CTG) nanocomposite thin films were synthesized by a facile production route. The TiO2/graphene (TG) nanocomposite was initially fabricated by sol-gel method in such a way that TiO2 nanoparticles loaded on graphene oxide (GO) sheet via photocatalytic process. Then, CdS nanoparticles were deposited on the TG thin film by successive ion layer adsorption and reaction process (SILAR) approach. Based on atomic force microscopy (AFM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses, the TG thin film possessed a larger surface area as compared with the pure TiO2 thin film due to presence of graphene sheet. UV/visible spectroscopy exhibited that visible absorption of the CTG samples increased with increasing CdS SILAR deposition cycle (n). Enhanced photocurrent response of the CTG(n) photoanodes measured as compared with the TG and T photoanodes due to good electrical conductivity and large surface area of graphene as well as the visible light-harvesting ability of CdS nanoparticles. Maximum photocurrent density of about 4.5 A/m2 and electron life time of about 5 s was measured for the CTG(30) photoanodes
  5. Keywords:
  6. CdS/TiO2/graphene nanocomposite ; Electron life time ; TiO2/grapheme ; Atomic force microscopy ; Cadmium sulfide ; Electrons ; Light ; Nanocomposite films ; Nanocomposites ; Nanoparticles ; Photocurrents ; Scanning electron microscopy ; Semiconductor quantum wells ; Sol-gel process ; Sol-gels ; Thin films ; Titanium dioxide ; Transmission electron microscopy ; Cds/tio ; Electrical conductivity ; Life-times ; Nanocomposite thin films ; Photocatalytic process ; Photocurrent density ; TiO ; UV/visible spectroscopy ; Graphene
  7. Source: Applied Surface Science ; Vol. 320, issue , 30 November , 2014 , pp. 772-779 ; ISSN: 01694332
  8. URL: http://www.sciencedirect.com/science/article/pii/S0169433214021588