International Journal on Recent and Innovation Trends in Computing and Communication ISSN: 2321-8169 Volume: 6 Issue: 7 74 - 76 ______________________________________________________________________________________ 74 IJRITCC | July 2018, Available @ http://www.ijritcc.org _____________________________________________________________ DC Conductivity Study of Cadmium Sulfide Nanoparticles Roshani N. Bhagat Asst. Prof, Dept of Engg Physics,PRPCEM, Amravati, India roshubhagat@gmail.com Manisha C. Golchha Asst. Prof, Dept of Engg Physics,PRPCEM, Amravati, India manisha_golchha22@yahoo.co.in Nilesh R. Thakare Asso. Prof, Dept of Engg Physics,PRPCEM, Amravati, India nilesh_thakarey@rediffmail.com Abstract- The dc conductivity of consolidated nanoparticle of CdS has been studied over the temperature range from 303 K to 523 K and the conductivity has been found to be much larger than that of single crystals. Keywords-CdS, Nanoparticles, DC Conductivity __________________________________________________*****_________________________________________________ 1.1 INTRODUCTION Encapsulation of metal atoms and nanosize clusters in organic media lead to formation of materials with the properties, different from ones of bulk substance. Such materials can be used in microelectronics, catalysis, optics, as very sensitive chemical sensors and in other fields of science and industry [1]. The physics of materials in the nano-size regime has been the subject of considerable theoretical and experimental studies during the last decade [2, 3, 4, 5, 6, 7,8, 9, 10, 11] The interest in this topic has mainly arose because of the general expectation and experimental evidence in a few cases that nano-particles may exhibit interesting and technologically important properties which are not possessed by bulk materials [12, 13, 14, 15, 5]. It has already been accepted that small clusters of atoms of metals have intriguing physical and electronic properties, [16, 17] each atom on its own has a well-defined set of electronic states. The N-atoms cluster of non-interacting atoms must have N-fold degeneracy for each electronic energy level. The interatomic electron interactions of the cluster remove this degeneracy and the allowed energy states spread into a band. In the case of small particles, the statistics of the electron-level distribution in addition to the density of energy states is important while, in bulk material, it is concerned only with the density of energy states. The electronic properties of polycrystalline materials and thin films consisting of small crystallites have been investigated in semiconductor [18, 19, 20, 21, 22]like CdS, the study of electrical conduction in systems consisting of nano-particles is very limited;[23, 24, 25, 26] particularly such studies in bulk samples obtained by consolidating nano-particles of important semiconductors is altogether lacking. It was felt that the study of electrical properties of pellets of nano-particles of semiconductors would be interesting. The results of such studies are expected to reflect the effect of finite size on the electrical conduction of small particles. Quantum size effects on the electronic properties have been investigated by many workers in the case of nanoparticles of CdS [3, 27, and 28]. 1.2 Fabrication and Preconditioning OfCdS Pellets Nano-particles of CdS were prepared by solution growth method. The prepared particles of CdS were washed repeatedly using distilled water. The water in the suspension was then removed by evaporation first and then heating in an oven at about 100°C. Pellets of nano-particles of CdS of diameter 1x10 -2 m and thickness 766.5 μm were made by applying a pressure of 4 tonnes/cm 2 in a hand operated hydraulic press at Government Pharmacy College, Amaravati. 1.3 I-V Characteristics of CdS Sample Resistivity measurements of sample (pellets of CdS) can be calculated by using the formula ȇ =   2ȆS Where, V = Voltage I = Current S = Point Spacing From this σ = 1  Figure 1.3 (a) shows the plot of current vs. applied voltage of CdS nanoparticles at room temperature. Initially