Singh S.P. – TechConnect Briefs

Well trap structures and bulk-nano environment luminescence centers in CaZnGe2O6:Tb3+ long afterglow phosphor

Woo B.K., Li Y., Singh S.P., Multimedia University, MY

A long afterglow phosphor CaZnGe2O6:Tb3+ has been prepared by using organic coated luminescence ZnO nanopowder through a high temperature solid-state reaction route. This new CaZnGe2O6:Tb3+ long afterglow phosphor sample emits the Tb3+ green fluorescence 543 [...]

Cytotoxic studies of PEG functionalized ZnO Nanoparticles on MCF-7 cancer cells

Rodriguez Martinez C., Ramirez Vick J.E., Perales O., Singh S.P., University of Puerto Rico-Mayagüez, US

Nanoparticles have shown great promise in biomedical applications. Zinc oxide (ZnO) nanoparticles are being explored for various applications such as sun screen lotion, antimicrobial properties, advanced textiles, photodynamic therapy and electronic devices. We have synthesized [...]

Multifunctional Fe3O4/ZnO core-shell nanoparticles for photodynamic therapy

Beltran J.C., Tomar M.S., Singh S.P., Perales O., Rivera L., Peña S., University of Puerto Rico-Mayagüez, PR

The photodynamic therapy (PDT) based on core-shell structures require efficient luminescence within specific wavelength range, preferably in near infrared. In the present study we aim to create a multifunctional platform for PDT through Fe3O4/ZnO core [...]

Microwave-assisted synthesis of water soluble ZnSe@ZnS quantum dots

Bailon-Ruiz S.J., Perales-Perez O., Singh S.P., University Of Puerto Rico at Mayaguez, PR

Semiconductors nanocrystals known as quantum dots (QD’s) have attracted much attention because of their optical properties can be tuned just by controlling their crystal-size, composition and shape at the nanoscale. Compared to organic dyes, quantum [...]

Thermal Analysis of Polyimide-Cobalt Ferrite Nanocomposites

Mazuera D., Perales-Perez O., Singh S.P., Suarez O.M., University of Puerto Rico-Mayagüez, PR

Thermal stability and thermomechanical behavior of new polymer-based nanocomposite was investigated to assess the viability of the fabrication process. The nanocomposite film consisted of a polyimide (PI) matrix and nanodispersoids of a recently developed high-coercivity [...]

Preparation and Characterization of Polyimide-Cobalt Ferrite Nanocomposite

Mazuera D., Cedeño Y., Perales-Perez O., Singh S.P., University of Puerto Rico-Mayagüez, PR

Synthesized 20 nm cobalt ferrite single crystals, which exhibited a coercivity of 2.9kOe at room-temperature, were dispersed in precursor polyamic acid at different volume fractions and cured at 300oC to develop the polyimide matrix. Polyamic [...]

Room-Temperature Synthesis and Characterization of Highly Monodisperse Transition Metal-Doped ZnO Nanocrystals

Singh S.P., Perales-Perez O., Tomar M.S., Parra-Palomino A., Ruiz-Mendoza A., University of Puerto Rico, PR

We present here the results of our current efforts on size-controlled synthesis of bare and Mn- and Co-doped ZnO nanocrystals. Stable suspensions of these materials were produced in ethanol solutions at room-temperature. XRD characterization of [...]