Next Article in Journal
Experimental Investigation of the Piezoresistive Properties of Cement Composites with Hybrid Carbon Fibers and Nanotubes
Next Article in Special Issue
A Ratiometric Fluorescent Sensor for Cd2+ Based on Internal Charge Transfer
Previous Article in Journal
Concept and Evaluation of a New Piezoelectric Transducer for an Implantable Middle Ear Hearing Device
Previous Article in Special Issue
Development and Elucidation of a Novel Fluorescent Boron-Sensor for the Analysis of Boronic Acid-Containing Compounds
Open AccessArticle

A Simple Assay for Ultrasensitive Colorimetric Detection of Ag+ at Picomolar Levels Using Platinum Nanoparticles

1
Key Laboratory of Predictive Microbiology and Chemical Residual Analysis, College of Food Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China
2
The Key Lab of Analysis and Detection Technology for Food Safety of the MOE, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350108, China
3
Department of Pharmaceutical Analysis, Faculty of Pharmacy, Fujian Medical University, Fuzhou 350108, China
*
Authors to whom correspondence should be addressed.
Sensors 2017, 17(11), 2521; https://doi.org/10.3390/s17112521
Received: 17 September 2017 / Revised: 26 October 2017 / Accepted: 31 October 2017 / Published: 2 November 2017
(This article belongs to the Special Issue Fluorescent Probes and Sensors)
In this work, uniformly-dispersed platinum nanoparticles (PtNPs) were synthesized by a simple chemical reduction method, in which citric acid and sodium borohydride acted as a stabilizer and reducer, respectively. An ultrasensitive colorimetric sensor for the facile and rapid detection of Ag+ ions was constructed based on the peroxidase mimetic activities of the obtained PtNPs, which can catalyze the oxidation of 3,3’,5,5’-tetramethylbenzidine (TMB) by H2O2 to produce colored products. The introduced Ag+ would be reduced to Ag0 by the capped citric acid, and the deposition of Ag0 on the PtNPs surface, can effectively inhibit the peroxidase-mimetic activity of PtNPs. Through measuring the maximum absorption signal of oxidized TMB at 652 nm, ultra-low detection limits (7.8 pM) of Ag+ can be reached. In addition to such high sensitivity, the colorimetric assay also displays excellent selectivity for other ions of interest and shows great potential for the detection of Ag+ in real water samples. View Full-Text
Keywords: platinum nanoparticles; peroxidase-mimic activity; colorimetric sensor; silver ions detection platinum nanoparticles; peroxidase-mimic activity; colorimetric sensor; silver ions detection
Show Figures

Figure 1

MDPI and ACS Style

Wang, Y.-W.; Wang, M.; Wang, L.; Xu, H.; Tang, S.; Yang, H.-H.; Zhang, L.; Song, H. A Simple Assay for Ultrasensitive Colorimetric Detection of Ag+ at Picomolar Levels Using Platinum Nanoparticles. Sensors 2017, 17, 2521.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop