量子点水凝胶的抗菌性研究

Ó 2015 Elsevier B.V. All rights reserved.
1. Introduction
Due to broad diversity of major efficiency in biological field and optoelectronic, nanotechnology is currently a severe area of scientific research. Nowadays, the study of semiconductor nanoparticles has much consideration because of their novel electronic and optical properties [1]. Nanoparticles (NPs) such as PbS, CdSe and CdS have thin band gap semiconductor quantum dots which have been used as photocatalysts in recently. Among all, silver sulfide nanoparticles are major materials as photocatalysts. Ag2S is a direct, thin-band gap semiconductor with good optical limiting and great chemical stability properties [2–4]. Ag2S has a direct band gap (0.9–1.05 eV), and large absorption coefficient which demonstrates a performance semiconductor material for photovoltaic application [2]. The unparalleled properties of Ag2S NPs led to diversity of applications, such as, in light emitting diodes and switches, photo-detectors, solar cells, magnetic field sensors, IR detectors, optical filters, photoconductors and room temperature oxygen sensors [1,3,5,6].
journal homepage: /locate/jphotobiol
Structural, optical, photoluminescence and antibacterial properties of copper-doped silver sulfide nanoparticles
article info
Article history: Received 26 March 2015 Received in revised form 22 May 2015 Accepted 25 May 2015 Available online 27 May 2015
Keywords: Cu doped Ag2S Photoluminescence Photocatalytic degradation Antibacterial activity
The Cu doped Ag2S Nanoparticles (Ag1ÀxCuxS where x = 0.00, 0.05, and 0.10) were synthesized according to the following procedure: Freshly prepared 50 mL of aqueous solution of 0.1 M Na2S was added dropwise to 50 mL of 0.1 M solution of AgNO3 and 50 mL of 0.1 M solution of CuSO4Á5H2O using vigorous stirring and then added 0.05 g of PVP capping agent. After the completion of reaction, the solution was aged for 45 min. The residual solution was filtered and washed several times with distilled water. The
⇑ Corresponding author.
E-mail address: ali.fakhri88@ (A. Fakhri).
/10.1016/j.jphotobiol.2015.05.013 1011-1344/Ó 2015 Elsevier B.V. All rights reserved.
Doping is a commonly applied method to treat magnetic, electrical and optical properties of semiconductor compounds, used in making most optoelectronic and electronic devices. Among transition metal ions, copper (Cu) is the major promising dopant, because of its catalytic activity [7–9]. Therefore, the characterization of transition metal ion states is vion and analytic instruments
A scanning electron microscope (SEM); JEOL JSM-5600 Digital Scanning Electron Microscope, transmission electron microscopy (TEM, JEM-2100F HR, 200 kV), and X-ray diffractometer (XRD) Philips X’Pert were used for samples characterization. UV–vis DRS mensuration was performed in a double beam spectrophotometer (JASCO V-550). The SEM (JSM 6701F—6701) was using for examination of surface morphology. Photoluminescence studies were performed using TEC Avaspec 2048 Spectrophotometer (excitation source = Xenon arc lamp 450 W). The catalyst compositions were analyzed with an energy dispersive X-ray spectrometer (EDX-700HS, SHIMADZU).
Journal of Photochemistry and Photobiology B: Biology 149 (2015) 78–83
Contents lists available at ScienceDirect
Journal of Photochemistry and Photobiology B: Biology
In the present work, synthesis of un-doped and Cu2+ doped Ag2S nanoparticles, and morphological, spectroscopic, structural properties were studied in detail. These materials may have potential application in lighting devices and solar cells.
2. Material and methods
In this study, raw materials were purchased from Sigma– Aldrich Ltd.
2.1. Synthesis of un-doped and Cu doped Ag2S NPs
Ag2S NPs was synthesized by a co-precipitation method. Briefly, 50 mL of Na2S solution (0.001 M) was added dropwise to 50 mL of AgNO3 solution (0.001 M) at 80 °C. PVP solution was added to the above mixture, once it attained 60 °C. Then solutions were stirred under magnetic stirrer for 3 h until it turned into a light brown color with black precipitates on the surface and then calcined at 100 °C for 30 min.
abstract
The Ag2S and Cu doped Ag2S nanoparticles were prepared by simple chemical co-precipitation method and characterized by XRD, SEM, EDX, TEM, PL and UV–vis spectra. The photocatalytic activity of Ag2S and Cu doped Ag2S nanoparticles were investigated with Ofloxacin antibiotic, which is part of the fluoroquinolone family. The morphological study indicated that the products were spherical shape in with diameter size of 30 nm. The photocatalytic results demonstrated that the Cu doping increased the photocatalytic efficiency of Ag2S nanoparticles. The outcome of antibacterial experiment under visible light irradiation indicate that the Cu doped Ag2S nanoparticles represent increased antibacterial performance compared with un-doped Ag2S nanoparticles.