Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/91753
Title: Highly sensitive naked eye detection of Iron (III) and H2O2 using poly-(tannic acid) (PTA) coated Au nanocomposite
Authors: Fang, Yan
Tan, Jiajun
Choi, Hyunjun
Lim, Sierin
Kim, Dong-Hwan
Keywords: Tannic Acid
Engineering::Chemical engineering
Visual detection
Issue Date: 2017
Source: Fang, Y., Tan, J., Choi, H., Lim, S., & Kim, D.-H. (2018). Highly sensitive naked eye detection of Iron (III) and H2O2 using poly-(tannic acid) (PTA) coated Au nanocomposite. Sensors and Actuators B: Chemical, 259, 155-161. doi:10.1016/j.snb.2017.12.031
Series/Report no.: Sensors and Actuators B: Chemical
Abstract: In the present study, we present a room temperature-, one-pot method for the synthesis of functional poly (tannic acid) (PTA)-based core@shell nanocomposites (core@PTA). The addition of tannic acid (TA) to gold (Au) salt solutions at mildly alkaline pH induced reduction of the metal salts to Au nanoparticles (NPs) while TA was oxidized and self-polymerized before encapsulating the AuNPs to form Au@PTA. Through the use of coordination chemistry, the synthesized Au@PTA was utilized as a naked eye sensor for iron (III) ions and H2O2. In the presence of Fe3+, Au@PTA aggregated and resulted in visible color change, showing high selectivity towards Fe3+ with visual detection limit of 20 μM. Extension of the approach is used to detect H2O2 with visual detection limit of 0.4 μM. Observation of the UV–vis spectra after the addition of analytes for the two detection systems revealed an additional peak in the H2O2 detection system at ∼ 650 nm. This is due to the presence of “wire-like” oligomer structures in the H2O2 detection system as opposed to nanocomposite aggregation observed in the former system.
URI: https://hdl.handle.net/10356/91753
http://hdl.handle.net/10220/49920
ISSN: 0925-4005
DOI: 10.1016/j.snb.2017.12.031
Rights: © 2017 Elsevier B.V. All rights reserved. This paper was published in Sensors and Actuators B: Chemical and is made available with permission of Elsevier B.V.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SCBE Journal Articles

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