Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Morphological variations in cadmium sulfide nanocrystals without phase transformation | Dhage et al. Nanoscale Research Letters 2011 6 420 http content 6 1 420 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Morphological variations in cadmium sulfide nanocrystals without phase transformation Sanjay R Dhage1 4 Henry A Colorado2 5 and Thomas Hahn1 2 3 Abstract A very novel phenomenon of morphological variations of cadmium sulfide CdS nanorods under the transmission electron microscopy TEM beam was observed without structural phase transformation. Environmentally stable and highly crystalline CdS nanorods have been obtained via a chemical bath method. The energy of the TEM beam is believed to have a significant influence on CdS nanorods and may melt and transform them into smaller nanowires. Morphological variations without structural phase transformation are confirmed by recording selected area electron diffraction at various stages. The prepared CdS nanorods have been characterized by X-ray powder diffraction TEM UV-Vis spectroscopy and photoluminescence spectroscopy. The importance of this phenomenon is vital for the potential application for CdS such as smart materials. Introduction Intensive research has been conducted on one-dimensional semiconductors due to their fundamental significance for studying the dependence of various physical properties on dimensionality and size reduction as well as the potential for applications in nanodevices 1 2 . In recent years controlling the morphology and size of nanomaterials has been a crucial issue in nanoscience research due to their fundamental shape- and size-dependent properties and significant applications. Cadmium sulfide CdS is one of the important direct band II-VI semiconductors. It has a band gap of eV at room temperature having vital optoelectronic applications for laser light-emitting diodes and optical devices based on nonlinear properties 3 4 . As an important II-VI semiconductor material CdS nanocrystal has received considerable interest
