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Issue 22, 2014
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Luminescent carbon nanoparticles: effects of chemical functionalization, and evaluation of Ag+ sensing properties

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Abstract

Luminescent carbon-based nanoparticles, addressed as carbon dots (CDs), were synthesized at relatively low temperature from lactose following an easy and inexpensive procedure. Modification of their surface was done by functionalization with mercaptosuccinic acid (MSA) (CDs–MSA). Transmission electron microscopy images showed regular spherical nanoparticles of 5 nm diameter. Raw and functionalized (CDs–MSA) CDs were highly fluorescent at 448 and 472 nm, with relative high quantum yield (Φ = 0.21 and 0.46 respectively). At the maximum fluorescence of CDs–MSA the intensity was quenched by addition of Ag+ ions by a static mechanism with a Stern–Volmer constant of 3.7 × 103 M−1. The analysis of the emission spectra showed that the CD–MSA complex was stable after this process. The quenching profiles showed that only 44% of the CD–MSA fluorophores are accessible to Ag+. The main figures of merit were detection and quantification limits of 385.8 nM and 1.2 μM respectively, and the precision as relative standard deviation was 1.76%. No interference was observed when other metal ions were present indicating a high selectivity for Ag+ detection. The results showed that CDs–MSA can be used for efficient quantification of Ag+ in silver nanoparticle dissolution.

Graphical abstract: Luminescent carbon nanoparticles: effects of chemical functionalization, and evaluation of Ag+ sensing properties

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Supplementary files

Article information


Submitted
16 Jan 2014
Accepted
10 Mar 2014
First published
13 Mar 2014

J. Mater. Chem. A, 2014,2, 8342-8351
Article type
Paper

Luminescent carbon nanoparticles: effects of chemical functionalization, and evaluation of Ag+ sensing properties

M. Algarra, B. B. Campos, K. Radotić, D. Mutavdžić, T. Bandosz, J. Jiménez-Jiménez, E. Rodriguez-Castellón and J. C. G. Esteves da Silva, J. Mater. Chem. A, 2014, 2, 8342
DOI: 10.1039/C4TA00264D

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