OICC Press International Nano Letters 2228-5326 3 1 (December 2013) 2013 11 14 Structural, optical, and electrical properties of thioglycolic acid-capped CdTe quantum dots thin films 10.1186/2228-5326-3-56 EN Rostam Moradian Department of Physics, Razi University, Kermanshah, IR Nano Science and Nano Technology Research Center, Razi University, Kermanshah, IR Computational Physical Science Research Laboratory, Department of Nano-Science, Institute for Studies in Theoretical Physics and Mathematics (IPM), Tehran, IR Mohammad Elahi Department of Physics, Razi University, Kermanshah, IR Ahmad Hadizadeh Department of Physics, Razi University, Kermanshah, IR Mahmoud Roshani Department of Chemistry, Ilam University, Ilam, IR Atefeh Taghizadeh Department of Physics, Razi University, Kermanshah, IR Reza Sahraei Department of Chemistry, Ilam University, Ilam, IR Journal Article 2013 11 14 Abstract Water-soluble cadmium telluride (CdTe) quantum dots (QDs) were synthesized using thioglycolic acid as capping agent; this reaction was carried out at pH = 10.2 and refluxed at 100°C for 18 h. The CdTe QDs prepared at various reflux times from 1 to 18 h were coated on the glass substrates to obtain thin films of the CdTe QDs with the same thickness. The CdTe thin films were characterized by X-ray diffraction, ultraviolet-vis spectroscopy, and photoluminescence spectroscopy. The absorption thresholds of the CdTe thin films are blueshifted by about 0.65 eV with respect to the bulk value (1.5 eV), due to the quantum size effect as expected from the nanocrystalline nature of the CdTe QDs. X-ray diffraction showed that the films consisted of small CdTe nanocrystallites, 2.91 to 3.57 nm in size, showing quantum size effects. The effects of temperature on the electrical properties of the films were studied in detail. Electrical resistivity measurements were carried out for different films in the temperature range from 343 to 463 K. It is shown that activation energy increases by increasing the reflux time.