A simple and cost effective chemical technique has been utilized to prepare cadmium sulphide (CdS) nanoparticles at room temperature. The sample is characterized with XRD (X-ray diffractometer), SEM (scanning electron microscope), TEM (transmission electron microscope), FTIR (Fourier transform infrared), EDX (energy dispersive X-rays), and UV-VIS (ultraviolet visible) spectrophotometer. The particle size estimated using X-ray line broadening method is ~21.5？nm. While particle size estimation, both instrumental and strain broadening was taken into account. The lattice strain was evaluated using Williamson-Hall equation. SEM illustrates formation of submicron size crystallites and TEM image gives a particle size of ~23.5？nm. The characteristic stretching vibration frequency of CdS was observed in the absorption band in FTIR spectrum. Optical absorption study exhibits a band gap energy value of about 2.44？eV. 1. Introduction Semiconductor nanoparticles are an important class of materials with numerous applications in the fabrication of optoelectronic devices, photonic transducers, and photoluminescent tags for biological studies [1]. Nanometer-sized semiconductors exhibit structural, electronic, optical, luminescence, and photoconducting properties very different from their bulk properties [2, 3]. Large-scale synthesis of semiconductor nanoparticles such as solid powder is critically important not only for the study of their physical properties but also for their industrial applications in the areas of catalysis, photocatalysis, and microelectronics. Cadmium sulphide is an important semiconductor and has many optoelectronic applications including solar cells, photodiodes, light emitting diodes, nonlinear optics, heterogeneous photocatalysis, high-density magnetic information storage, and many others in semiconductor industries [4, 5]. The characteristic absorption of light for CdS is in the visible range with a bulk band gap of ~2.4？eV at room temperature [5]. Many of these nanoparticles can be prepared using simple wet-chemical methods of synthesis that allow one to manipulate the electronic properties of the particles [6–9]. In powder form, CdS has been synthesized using hydrothermal/solvothermal methods, thermal decomposition [10–12], single-molecule precursors approach [13], and chemical precipitation technique with or without capping agent [4]. In the presented work, a chemical dipping technique has been utilized to prepare nanopowders of CdS at room temperature. The technique involves successive dipping of a precleaned substrate in separately placed
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