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      Highly sensitive naked eye detection of Iron (III) and H2O2 using poly-(tannic acid) (PTA) coated Au nanocomposite

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      Sensors Actuator B Accepted Manuscript.pdf (1.151Mb)
      Author
      Fang, Yan
      Tan, Jiajun
      Choi, Hyunjun
      Lim, Sierin
      Kim, Dong-Hwan
      Date of Issue
      2017
      School
      School of Chemical and Biomedical Engineering
      Version
      Accepted version
      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.
      Subject
      Tannic Acid
      Visual detection
      Engineering::Chemical engineering
      Type
      Journal Article
      Series/Journal Title
      Sensors and Actuators B: Chemical
      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.
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      http://dx.doi.org/10.1016/j.snb.2017.12.031
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