The Effects of Reduced Graphene Oxide (rGO) on ZnO Film UV-Detector

In this work, pure and graphene incorporated ZnO thin films were prepared by solgel method on glass substrates and influence of graphene doping on the structural, electrical and optical properties of the films were studied. The results of Raman spectrum indicated the coexistence of ZnO and rGO in composite thin film. The FT-IR analysis of the composite sample showed that ZnO, ZnO-C heterojunction and C-C graphene skeletal peak are formed. The UV-Vis spectrum showed that both the transparency and band gap was partially decreased by graphene incorporation. The linear trend of I-V curve suggests an ohmic contact between ZnO and graphene nanosheets. In addition, the resistivity was decreased from 4.32×102 Ω.cm for pure ZnO film to 2.4×101 Ω.cm for composite film. The composite photodetector possessed a desirable signal to noise ratio and UV-sensitivity while the response time decreased to half of pure ZnO. The above results suggest that 0.225 wt.% rGO incorporation can improve the ultraviolet detection of ZnO thin film.

[1]  J. Lian,et al.  Photoconductive enhancement effects of graphene quantum dots on ZnO nanoparticle photodetectors , 2012, 2012 Lester Eastman Conference on High Performance Devices (LEC).

[2]  Dan Xu,et al.  Facile, mild and fast thermal-decomposition reduction of graphene oxide in air and its application in high-performance lithium batteries. , 2012, Chemical communications.

[3]  O. Akhavan,et al.  Functionalized carbon nanotubes in ZnO thin films for photoinactivation of bacteria , 2011 .

[4]  K. Y. Rajpure,et al.  Fast response ultraviolet Ga-doped ZnO based photoconductive detector , 2011 .

[5]  H. Afarideh,et al.  UV detecting properties of hydrothermal synthesized ZnO nanorods , 2011 .

[6]  Minsu Lee,et al.  High-performance photoresponse from single-walled carbon nanotube–zinc oxide heterojunctions , 2011 .

[7]  Omid Akhavan,et al.  Toxicity of graphene and graphene oxide nanowalls against bacteria. , 2010, ACS nano.

[8]  O. Akhavan,et al.  Visible light photo-induced antibacterial activity of CNT–doped TiO2 thin films with various CNT contents , 2010 .

[9]  Tae Whan Kim,et al.  Enhancement of the photocurrent in ultraviolet photodetectors fabricated utilizing hybrid polymer-ZnO quantum dot nanocomposites due to an embedded graphene layer , 2010 .

[10]  P. Cochat,et al.  Et al , 2008, Archives de pediatrie : organe officiel de la Societe francaise de pediatrie.

[11]  S. Stankovich,et al.  Graphene-silica composite thin films as transparent conductors. , 2007, Nano letters.

[12]  J. Thong,et al.  Multiwalled Carbon Nanotubes Beaded with ZnO Nanoparticles for Ultrafast Nonlinear Optical Switching , 2006 .

[13]  M. Parsa.  Ultrafine grained and nano-structured materials IV : selected, peer reviewed papers from the 4[th] International Conference on Ultrafine Grained and Nano-Structured Materials (UFGNSM 2013), November 5-6, 2013, Tehran, Iran , 2014 .

[14]  H. Chang,et al.  Incorporation of carbon nanotube into direct-patternable ZnO thin film formed by photochemical solution deposition , 2009 .

[15]  J. Tauc,et al.  Optical properties and electronic structure of amorphous Ge and Si , 1968 .