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Full-Text Articles in Physical Sciences and Mathematics
A Simple Biogenic Route To Rapid Synthesis Of Au@Tio2 Nanocomposites By Electrochemically Active Biofilms, Mohammad Mansoob Khan Dr, M. H. Cho
A Simple Biogenic Route To Rapid Synthesis Of Au@Tio2 Nanocomposites By Electrochemically Active Biofilms, Mohammad Mansoob Khan Dr, M. H. Cho
Dr. Mohammad Mansoob Khan
Deposition of gold on titanium dioxide (TiO2) nanoparticles is highly beneficial for maximizing the efficiency of many photocatalytic reactions. In this study, we have reported for the first time the use of an electrochemically active biofilm (EAB) for the synthesis of Au@TiO2 nanocomposite with sodium acetate as the electron donor. The EAB acts as an electron generator for the reduction of gold ions on the surface of TiO2 nanoparticles. It was observed that the TiO2 plays not only as a support for the gold nanoparticles but also as a storage of electrons produced by the EAB within the particles. These …
Synthesis Of Cysteine Capped Silver Nanoparticles By Electrochemically Active Biofilm And Their Antibacterial Activities, Mohammad Mansoob Khan Dr, M. H. Cho Dr
Synthesis Of Cysteine Capped Silver Nanoparticles By Electrochemically Active Biofilm And Their Antibacterial Activities, Mohammad Mansoob Khan Dr, M. H. Cho Dr
Dr. Mohammad Mansoob Khan
Cysteine capped silver nanoparticles (Cys-AgNPs) have been synthesized by employing electrochemically active biofilm (EAB), AgNO3 as precursor and sodium acetate as electron donor in aqueous solution at 30 oC. Cys-AgNPs of 5-10 nm were synthesized and characterized by UV-Vis, FT-IR, XRD and TEM. Capping of the silver nanoparticles with cysteine provides stability to nanoparticles by a thiolate bond between the amino acid and the nanoparticle surface and hydrogen bonding among the Cys-AgNPs. In addition, the antibacterial effects of as-synthesized Cys-AgNPs have been tested against two pathogenic bacteria Escherichia coli (O157:H7) and Pseudomonas aeruginosa (PAO1). The results demonstrate that the as-synthesized …
Enhancement In The Photocatalytic Activity Of Au@Tio2 Nanocomposites By Pretreatment Of Tio2 With Uv Light, Mohammad Mansoob Khan Dr, M. H. Cho Dr
Enhancement In The Photocatalytic Activity Of Au@Tio2 Nanocomposites By Pretreatment Of Tio2 With Uv Light, Mohammad Mansoob Khan Dr, M. H. Cho Dr
Dr. Mohammad Mansoob Khan
A novel, efficient and controlled protocol for the synthesis and enhanced photocatalytic activity of Au@TiO2 nanocomposite is developed. TiO2 (P25) was pretreated by employing UV light (λ = 254 nm) and the pretreated TiO2 was uniformly decorated by gold nanoparticles (AuNPs) in presence of sodium citrate and UV light. UV pretreatment makes the TiO2 activated, as electrons were accumulated within the TiO2 in the conduction band. These accumulated electrons facilitate the formation of AuNPs which were of very small size (2-5 nm), similar morphology and uniformly deposited at TiO2 surface. It leads to formation of stable and crystalline Au@TiO2 nanocomposites. …