Highly sensitive SPR response of Au/chitosan/graphene oxide nanostructured thin films toward Pb (II) ions

Nurul Fariha Lokman, Ahmad Ashrif A Bakar, Fatihah Suja`, Huda Abdullah, Wan Baihaqi Wan Ab Rahman, Nay Ming Huang, Mohd Hanif Yaacob

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Optical sensors based on surface plasmon resonance (SPR) are utilized for detecting toxic heavy metals in solutions. To improve the sensitivity of SPR sensors, nanostructured thin films with active layers can be synthesized. In this study, the response to Pb (II) was measured and compared for SPR sensors incorporating gold-chitosan-graphene oxide (Au/CS/GO) nanostructured thin films and Au/CS films. The characterization of Au/CS/GO using FESEM analysis revealed a film composed of nanosheets with wrinkled, rough surfaces. The results from XRD analysis confirmed the successful incorporation of GO in the prepared films. Additionally, AFM analysis determined that the Au/CS/GO films had a root mean square (rms) roughness of 28.38 nm and were considerably rougher than the Au/CS films. Upon exposure to a 5 ppm Pb (II) ion solution, the Au/CS/GO films exhibited higher SPR sensitivity, as much as 1.11200 ppm-1, than Au/CS films, 0.77600 ppm-1. This enhancement of the SPR response was attributed to strong covalent bonding between CS and GO in these films. These results indicated that the Au/CS/GO films show potential for the detection of heavy metal pollution in environmental applications.

Original languageEnglish
Pages (from-to)459-466
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume195
DOIs
Publication statusPublished - May 2014

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Graphite
Chitosan
Surface plasmon resonance
surface plasmon resonance
Oxides
Graphene
graphene
Ions
Thin films
oxides
thin films
ions
heavy metals
Heavy Metals
Heavy metals
Nanosheets
Poisons
sensitivity
sensors
Sensors

Keywords

  • Chitosan
  • Graphene oxide
  • Lead ion
  • Nanostructured thin film
  • Surface plasmon resonance

ASJC Scopus subject areas

  • Instrumentation
  • Materials Chemistry
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Highly sensitive SPR response of Au/chitosan/graphene oxide nanostructured thin films toward Pb (II) ions. / Lokman, Nurul Fariha; A Bakar, Ahmad Ashrif; Suja`, Fatihah; Abdullah, Huda; Rahman, Wan Baihaqi Wan Ab; Huang, Nay Ming; Yaacob, Mohd Hanif.

In: Sensors and Actuators, B: Chemical, Vol. 195, 05.2014, p. 459-466.

Research output: Contribution to journalArticle

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