Center for Nanotechnology Research

Guangzhou, China

Center for Nanotechnology Research

Guangzhou, China
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Konjari R.S.,Center for Nanotechnology Research | Jacob A.A.,Center for Nanotechnology Research | Jayanthi S.,Vellore Institute of Technology | Ramalingam C.,Vellore Institute of Technology | Ethiraj A.S.,Center for Nanotechnology Research
International Journal of Pharmacy and Pharmaceutical Sciences | Year: 2015

Objective: This work mainly focuses on the investigation of optical, structural and morphological characteristics of Silver nanoparticles (Ag-NPs) synthesized using Papaya (Carica Papaya) leaf extract and to study the mechanisms involved in the formation. Methods: Ag-NPs were synthesized using colloidal method from silver nitrate using aqueous leaf extract of Papaya as reducing agent. Spectral analysis of Ag-NPs was done using UV-Vis spectroscopy and optical characteristics were studied. Fourier Transform Infrared (FTIR) analysis was done to investigate the mechanisms involved in the reaction. A detailed study of structural and morphological properties was done using X-Ray Diffraction (XRD) and Atomic Force Microscopy (AFM). Results: Spherical shaped Ag-NPs of Face Centered Cubic (FCC) structure were formed and the average particle size was in the range 25-35 nm. Conclusion: Papaya is a good reducing agent for the synthesis of Ag-NPs. Since it is a plant with medicinal values, thus synthesized Ag-NPs can be used for medicinal implications. © 2015, International Journal of Pharmacy and Pharmaceutical Science. All right reserved.


Li L.,Center for Nanotechnology Research | Liu Z.,Center for Nanotechnology Research | Li M.,Center for Nanotechnology Research | Hong L.,Center for Nanotechnology Research | And 5 more authors.
Journal of Physical Chemistry C | Year: 2013

Nanostructured materials such as nanowire arrays often absorb light more strongly than thin films, so they can be used to improve the performance of solar cells. In this study, a series of self-grown Cu2S nanowire arrays with different diameters, lengths, and morphologies is prepared by solid-gas reaction between Cu foil and a mixture of H2S and O 2. The structure of the arrays is characterized by XRD, TEM, XPS, and Raman. Their light absorption performance is investigated systematically by diffuse reflectance and photoluminescence spectroscopy. The nanowire arrays are single-crystal Cu2S semiconductors, and their band gap can be adjusted by changing the morphology, diameter, and length of nanowires in the arrays. The light-absorption ability is enhanced from 70% for a planar Cu 2S film to 93.5% for a Cu2S nanowire arrays and is less sensitive to both the wavelength and incident angle of light because of the morphology and distribution of the nanowires. The light absorption is high (about 92-95%) over a wide range of wavelengths (240-670 nm) and only decreases by 3% as the incident angle increases from 10 to 40. This research shows the potential of Cu2S nanowire arrays for use in solar energy applications. © 2013 American Chemical Society.

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