Tuning the field distribution and fabrication of an Al@ZnO core–shell nanostructure for a SPR-based fiber optic phenyl hydrazine sensor

Abstract

We report the fabrication and characterization of a surface plasmon resonance (SPR)-based fiber optic sensor that uses coatings of silver and aluminum (Al)-zinc oxide (ZnO) core-shell nanostructure (Al@ZnO) for the detection of phenyl hydrazine (Ph-Hyd). To optimize the volume fraction (f) of Al in ZnO and the thickness of the core-shell nanostructure layer (d), the electric field intensity along the normal to the multilayer system is simulated using the two-dimensional multilayer matrix method. The Al@ZnO core-shell nanostructure is prepared using the laser ablation technique. Various probes are fabricated with different values of f and an optimized thickness of core-shell nanostructure for the characterization of the Ph-Hyd sensor. The performance of the Ph-Hyd sensor is evaluated in terms of sensitivity. It is found that the Ag/Al@ZnO nanostructure core-shell-coated SPR probe with f = 0.25 and d = 0.040 μm possesses the maximum sensitivity towards Ph-Hyd. These results are in agreement with the simulated ones obtained using electric field intensity. In addition, the performance of the proposed probe is compared with that of probes coated with (i) Al@ZnO nanocomposite, (ii) Al nanoparticles and (iii) ZnO nanoparticles. It is found that the probe coated with an Al@ZnO core-shell nanostructure shows the largest resonance wavelength shift. The detailed mechanism of the sensing (involving chemical reactions) is presented. The sensor also manifests optimum performance at pH 7.

Simultaneous estimation of vitamin K1 and heparin with low limit of detection using cascaded channels fiber optic surface plasmon resonance

“…The polybrene incorporated into ZnO lattice occupies the position of some defects level of the ZnO similar to the phenomenon like the substitutional defects. This is similar to our previous study in which Pd occupies the position of ZnO in the form of substitutional impurity (Tabassum and Gupta, 2016).…”

“…The polybrene@ZnO core shell was synthesized using the pulsed laser ablation technique (Tabassum et al, 2016). The laser used in the setup was Nd: YAG (Neodymium-doped yttrium aluminium garnet) of wavelength 1064 nm, with 10 ns pulse width and repetition rate 100 kHz.…”

Laser Synthesis and Processing of Colloids: Fundamentals and Applications

“…Driven by increased electron transfer rate from pure NP surfaces and large surface areas from ultrasmall dimensions, LSPC-synthesized NMs have been widely employed for trace detection of poisonous substances, such as heavy metal ions, food or water pollutants (e.g., xanthine, pathogen, phenyl hydrazine), as well as flammable and explosive gases (e.g., CO, ethanol, HCl, H 2 ). ,,− Note that selectivity is very important for pollutant detection, for example, during HCl gas sensing using LAL-synthesized FeOCl nanosheets . In the following, one representative detector is introduced to show the potential of LSPC-synthesized NPs for various detection applications, covering heavy metal ion detection, biotoxin detection (immunosensing), and selective sensing of volatile compounds.…”

“…Driven by increased electron transfer rate from pure NP surfaces and large surface areas from ultrasmall dimensions, LSPC-synthesized NMs have been widely employed for trace detection of poisonous substances, such as heavy metal ions, food or water pollutants (e.g., xanthine, 1011 pathogen, 1012 phenyl hydrazine 1013 ), as well as flammable and explosive gases (e.g., CO, ethanol, HCl, H 2 ). 53,68,1014−1017 Note that selectivity is very important for pollutant detection, for example, during HCl gas sensing using LAL-synthesized FeOCl nanosheets.…”

Fiber-Optic Chemical Sensors and Biosensors (2015–2019)

“…A composite consisting of a silver and aluminum−zinc oxide core−shell nanostructure was found to be useful in detecting phenylhydrazine. 283 A SPR sensor was designed that uses this coating. Phenyl hydrazine can be detected in the range from 2.7 to 200 μg/L.…”