Der Pharma Chemica
Journal for Medicinal Chemistry, Pharmaceutical Chemistry, Pharmaceutical Sciences and Computational Chemistry

Abstract

A cost effective low temperature approach for developing highly biocompatible quantum dots: The role of pH and Cd concentration on Lcysteine stabilized CdSe quantum dots

Author(s): D. Sukanya and P. Sagayaraj

Water dispersible CdSe quantum dots (QDs) were synthesized in aqueous solutions through a chemical precipitation technique followed by hydrothermal treatment employing L-cysteine as a stabilizer. The influence of precursor concentration and pH of the solution on the quality of CdSe QDs were studied and discussed. The as-synthesized CdSe QDs were characterized by powder X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM) to confirm their structure and surface morphology. The size of the synthesized QDs was found to increase with pH. The optical properties such as absorption and emission wavelengths have been examined using UV-Vis absorption spectroscopy (UV-Vis) and photoluminescence spectroscopy (PL). It is observed from the PL spectra that there is a continuous reduction in the photoluminescence intensity of the CdSe QDs, as the pH value increases. To confirm the capping of L-cysteine and to study the surface properties of the synthesized CdSe QDs Fourier Transform Infra-red (FT-IR) and Fourier Transform Raman (FT-RAMAN) analyses were performed and the results are reported.


PDF

FIND ARTICLES
SCImago Journal & Country Rank
 
Erkek öyle sert ve acımaz sikiyor ki bayan çaresiz bir şekilde tırtıl misali sikiş yataktan aşağı doğru kayıyor fakat hem adam hemde kadın aşırı mobil porno derecede zevk alıyorlar Uzun zamandır karısı ile ilgili planları olan türk porno adam onu başkaları sikerken hayal ediyor bu durumu karısından sikiş izle gizliyordu fakat bir gün adamın moralinin bozuk olduğunu anlayan karısı sikiş ona ne olduğunu sordu ve adamda ona her şeyi anlatmıştı karısı bu porno resim durumdan Büyük zenci yarağı sevenler için özel olarak eklenmiş videomuz türk porno kalın ve damarlı zenci siki arayıp bulamayanlar için özel olarak sikiş izle yayınlanmıştır filmde ise sarışın zengin sürtük büyük mobil sikiş kalın damarlı alet sevdiğini bir çok kez dile getirmiş