Please use this identifier to cite or link to this item:
https://hdl.handle.net/10216/96961
Author(s): | algarra, m campos, bb miranda, ms da silva, jcge |
Title: | CdSe quantum dots capped PAMAM dendrimer nanocomposites for sensing nitroaromatic compounds |
Issue Date: | 2011 |
Abstract: | The detection of nitroaromatic compounds, best known as raw materials in explosives preparations, is important in many fields including environmental science, public security and forensics. CdSe quantum dots capped with PAMAM-G(4) dendrimer were synthetized in water and used for the detection of trace amounts of three nitroaromatic compounds: 4-methoxy-2-nitrophenol (MNP), 2-amine-5chloro-1,3-dinitrobenzene (ACNB) and 3-methoxy-4-nitrobenzoic acid (MNB). To increase the apparent water solubility of these compounds alpha-cyclodextrin (alpha-CD) was used to promote the formation of inclusion complexes. The studied nitroaromatic compounds (plus alpha-CD) significantly quenched the fluorescence intensity of the nanocomposite with linear Stern-Volmer plots. The Stern-Volmer constants (standard deviation in parenthesis) were: MNB, K(SV) = 65(5) x 10(4) M(-1); ACNB, K(SV) = 19(2) x 10(4) M(-1); and, MNP, K(SV) =33(1) x 10(2) M(-1). These constants suggest the formation of a ground state complex between the nitroaromatric compounds and the sensor which confers a relatively high analytical sensitivity. The detection sensibilities are about 0.01 mg L(-1) for MNB and ACNB and about 0.1 mg L(-1) for MNP. No interferences or small interferences are observed for trinitrotoluene [K(SV) =10(2) x 10(2) x M(-1)], 2,4-dinitrotoluene [K(SV) = 20(3) x 10 M(-1)], 2,6-dinitrotoluene [K(SV) = 11(4) x 10 M(-1)] and nitrobenzene [K(SV) = 2(1) x 10(3) x M(-1)]. |
Subject: | Química Chemical sciences |
Scientific areas: | Ciências exactas e naturais::Química Natural sciences::Chemical sciences |
URI: | https://hdl.handle.net/10216/96961 |
Document Type: | Artigo em Revista Científica Internacional |
Rights: | restrictedAccess |
Appears in Collections: | FCUP - Artigo em Revista Científica Internacional |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
48766.pdf Restricted Access | 492.83 kB | Adobe PDF | Request a copy from the Author(s) |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.