Next Article in Journal
A Monitoring System for Vegetable Greenhouses based on a Wireless Sensor Network
Previous Article in Journal
A Smart Checkpointing Scheme for Improving the Reliability of Clustering Routing Protocols
Article Menu

Export Article

Open AccessArticle
Sensors 2010, 10(10), 8953-8962;

Optical Sensing Properties of Dithiocarbamate-Functionalized Microspheres, Using a Polyvinylpyridine-Polyvinylbenzyl Chloride Copolymer

Chemistry and Chemical Technology Department, College of Science and Technology, Al-Quds University, Jerusalem, Israel
Author to whom correspondence should be addressed.
Received: 12 August 2010 / Revised: 20 September 2010 / Accepted: 25 September 2010 / Published: 8 October 2010
(This article belongs to the Section Chemical Sensors)
Full-Text   |   PDF [370 KB, uploaded 21 June 2014]   |  


In this study, a new modified optical chemical sensor based on swellable polymer microspheres is developed using a 5% copolymer of polyvinylpyridine-polyvinyl -benzyl chloride microspheres functionalized as the corresponding dithiocarbamate. This sensor demonstrated significant enhancements in sensitivity, dynamic range and response time. These improvements are related to the presence of pyridine in the polymer backbone, which is believed to increase the space between the groups, thus decreasing steric hindrance, and hence increasing substitution of the dithiocarbamate group. The hydrophilicity of pyridine also allows free movement of the solvent and analyte to and from the inside of the microspheres. These dithiocarbamate-derivatized polymer microspheres were embedded in a hydrogel matrix of polyvinylalcohol cross-linked with glutaraldehyde. This sensor responded selectively to Hg2+ solutions of different concentrations (1 × 10−5 M to 0.1 M). The observed turbidity measured as absorbance varied between 1.05 and 1.75 units at a wavelength of 700 nm. The response is based on the interaction between the metal cations with the negative charges of the deprotonated dithiocarbamate functional group, which led to neutratization of the charges and thus to polymer shrinking. As a result, an increase in the turbidity of the sensing element due to a change in the refractive index between the hydrogel and the polymer microspheres occured. The changes in the turbidity of the sensing element were measured as absorbance using a conventional spectrophotometer. View Full-Text
Keywords: optical sensor; dithiocarbamate-copolymer; polymer swelling optical sensor; dithiocarbamate-copolymer; polymer swelling

Graphical abstract

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Share & Cite This Article

MDPI and ACS Style

Shakhsher, Z.M.; Odeh, I.M.; Rajabi, I.M.; Khatib, M.K. Optical Sensing Properties of Dithiocarbamate-Functionalized Microspheres, Using a Polyvinylpyridine-Polyvinylbenzyl Chloride Copolymer. Sensors 2010, 10, 8953-8962.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top