Detection of formaldehyde in water: A shape-effect on the plasmonic sensing properties of the gold nanoparticles

Sri Nengsih, Ali Umar Akrajas, Muhamad Mat Salleh, Munetaka Oyama

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

The effect of morphology on the plasmonic sensing of the presence of formaldehyde in water by gold nanostructures has been investigated. The gold nanostructures with two different morphologies, namely spherical and rod, were prepared using a seedmediated method. In typical results, it was found that the plasmonic properties of gold nanostructures were very sensitive to the presence of formaldehyde in their surrounding medium by showing the change in both the plasmonic peaks position and the intensity. Spherical nanoparticles (GNS), for example, indicated an increase in the sensitivity when the size was increased from 25 to 35 nm and dramatically decreased when the size was further increased. An m value, the ratio between plasmonic peak shift and refractive index change, as high as 36.5 nm/RIU (refractive index unit) was obtained so far. An expanded sensing mode to FD was obtained when gold nanostructures with nanorods morphology (GNR) were used because of the presence of two plasmonic modes for response probing. However, in the present study, effective plasmonic peak shift was not observed due to the intense plasmonic coupling of closely packed nanorod structures on the surface. Nevertheless, the present results at least provide a potential strategy for response enhancement via shape-effects. High performance plasmonic sensors could be obtained if controlled arrays of nanorods can be prepared on the surface.

Original languageEnglish
Pages (from-to)10309-10325
Number of pages17
JournalSensors (Switzerland)
Volume12
Issue number8
DOIs
Publication statusPublished - Aug 2012

Fingerprint

Nanostructures
formaldehyde
Formaldehyde
Nanotubes
Gold
Nanoparticles
Nanorods
gold
nanorods
nanoparticles
Refractometry
Water
water
Refractive index
refractivity
shift
rods
augmentation
sensitivity
sensors

Keywords

  • Formaldehyde
  • Gold nanoparticles
  • LSPR
  • Optical sensor
  • Plasmonic properties

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Analytical Chemistry
  • Biochemistry

Cite this

Detection of formaldehyde in water : A shape-effect on the plasmonic sensing properties of the gold nanoparticles. / Nengsih, Sri; Akrajas, Ali Umar; Mat Salleh, Muhamad; Oyama, Munetaka.

In: Sensors (Switzerland), Vol. 12, No. 8, 08.2012, p. 10309-10325.

Research output: Contribution to journalArticle

Nengsih, Sri ; Akrajas, Ali Umar ; Mat Salleh, Muhamad ; Oyama, Munetaka. / Detection of formaldehyde in water : A shape-effect on the plasmonic sensing properties of the gold nanoparticles. In: Sensors (Switzerland). 2012 ; Vol. 12, No. 8. pp. 10309-10325.
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