Nanostructured Chitosan/Maghemite Composites Thin Film for Potential Optical Detection of Mercury Ion by Surface Plasmon Resonance Investigation

Fauzi, Nurul Illya Muhamad; Fen, Yap Wing; Omar, Nur Alia Sheh; Saleviter, Silvan; Daniyal, ‬Wan Mohd Ebtisyam Mustaqim Mohd; Hashim, Hazwani Suhaila; Nasrullah, Mohd

doi:10.3390/polym12071497

Cited by 60 publications

(22 citation statements)

References 75 publications

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“…Hence, SPR can be used to monitor any binding event optically, and also for sensing applications. SPR was previously reported to have numerous advantages, such as fast measurement, no necessity for a reference solution, cost-effective, and simple sample preparation [ 97 ]. However, SPR has low sensitivity in sensing metal ions below 100 ppm.…”

Section: Methodsmentioning

confidence: 99%

X-ray Photoelectron Spectroscopy Analysis of Chitosan–Graphene Oxide-Based Composite Thin Films for Potential Optical Sensing Applications

et al. 2021

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In this study, X-ray photoelectron spectroscopy (XPS) was used to study chitosan–graphene oxide (chitosan–GO) incorporated with 4-(2-pyridylazo)resorcinol (PAR) and cadmium sulfide quantum dot (CdS QD) composite thin films for the potential optical sensing of cobalt ions (Co2+). From the XPS results, it was confirmed that carbon, oxygen, and nitrogen elements existed on the PAR–chitosan–GO thin film, while for CdS QD–chitosan–GO, the existence of carbon, oxygen, cadmium, nitrogen, and sulfur were confirmed. Further deconvolution of each element using the Gaussian–Lorentzian curve fitting program revealed the sub-peak component of each element and hence the corresponding functional group was identified. Next, investigation using surface plasmon resonance (SPR) optical sensor proved that both chitosan–GO-based thin films were able to detect Co2+ as low as 0.01 ppm for both composite thin films, while the PAR had the higher binding affinity. The interaction of the Co2+ with the thin films was characterized again using XPS to confirm the functional group involved during the reaction. The XPS results proved that primary amino in the PAR–chitosan–GO thin film contributed more important role for the reaction with Co2+, as in agreement with the SPR results.

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Section: Methodsmentioning

confidence: 99%

X-ray Photoelectron Spectroscopy Analysis of Chitosan–Graphene Oxide-Based Composite Thin Films for Potential Optical Sensing Applications

et al. 2021

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“…Surface plasmon resonance (SPR) strategy has drawn great attention as an economical, label-free tool because of its ability to detect target compounds in high sensitivity, real-time manner and rapid detection [ 42 , 43 , 44 , 45 , 46 , 47 , 48 ]. The Kretschmann configuration-based SPR method works by detecting the resonance in the form of charge density oscillations between the analyte and a metal thin film [ 49 , 50 , 51 , 52 , 53 , 54 , 55 ].…”

Section: Optical Sensorsmentioning

confidence: 99%

Recent Advances on Detection of Insecticides Using Optical Sensors

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Omar

et al. 2021

Sensors

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Insecticides are enormously important to industry requirements and market demands in agriculture. Despite their usefulness, these insecticides can pose a dangerous risk to the safety of food, environment and all living things through various mechanisms of action. Concern about the environmental impact of repeated use of insecticides has prompted many researchers to develop rapid, economical, uncomplicated and user-friendly analytical method for the detection of insecticides. In this regards, optical sensors are considered as favorable methods for insecticides analysis because of their special features including rapid detection time, low cost, easy to use and high selectivity and sensitivity. In this review, current progresses of incorporation between recognition elements and optical sensors for insecticide detection are discussed and evaluated well, by categorizing it based on insecticide chemical classes, including the range of detection and limit of detection. Additionally, this review aims to provide powerful insights to researchers for the future development of optical sensors in the detection of insecticides.

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“…The light beam that passes through two different media with a higher to lower refractive index will be totally reflected if the incident angle is higher than the critical angle. The electromagnetic field component of the incident light will penetrate through the prism and reach the interface between the metal and dielectric medium to excite the free electron on the metal surface if the metal layer is thin enough [15][16][17][18][19][20][21][22]. As a result, the electron is excited and plasmon wave is formed that propagates along the metal surface.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, the surrounding properties to generate SPR have been investigated using a simulation and automatic fitting program that has been developed using the Matlab program to achieve the best SPR signal. between the metal and dielectric medium to excite the free electron on the metal surface if the metal layer is thin enough [15][16][17][18][19][20][21][22]. As a result, the electron is excited and plasmon wave is formed that propagates along the metal surface.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of Surface Plasmon Resonance Spectroscopy for Optical Constant Characterization and Potential Sensing Application: Theoretical and Experimental Approaches

et al. 2021

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The best surface plasmon resonance (SPR) signal can be generated based on several factors that include the excitation wavelength, the type of metal used, and the thickness of the metal layer. In this study, the aforementioned factors have been investigated to obtain the best SPR signal. The excitation wavelength of 633 nm and gold metal with thickness of 50 nm were required to generate the SPR signal before the SPR was used for optical constant characterization by fitting of experimental results to the theoretical data. The employed strategy has good agreement with the theoretical value where the real part refractive index, n value, of the gold thin film was 0.1245 while the value for the imaginary part, k, was 3.6812 with 47.7 nm thickness. Besides that, the optical characterization of nanocrystalline cellulose (NCC)-based thin film has also been demonstrated. The n and k values found for this thin film were 1.4240 and 0.2520, respectively, with optimal thickness of 9.5 nm. Interestingly when the NCC-based thin film was exposed to copper ion solution with n value of 1.3333 and k value of 0.0060 to 0.0070 with various concentrations (0.01–10 ppm), a clear change of the refractive index value was observed. This result suggests that the NCC-based thin film has high potential for copper ion sensing using SPR with a sensitivity of 8.0052°/RIU.

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Nanostructured Chitosan/Maghemite Composites Thin Film for Potential Optical Detection of Mercury Ion by Surface Plasmon Resonance Investigation

Cited by 60 publications

References 75 publications

X-ray Photoelectron Spectroscopy Analysis of Chitosan–Graphene Oxide-Based Composite Thin Films for Potential Optical Sensing Applications

X-ray Photoelectron Spectroscopy Analysis of Chitosan–Graphene Oxide-Based Composite Thin Films for Potential Optical Sensing Applications

Recent Advances on Detection of Insecticides Using Optical Sensors

Design and Optimization of Surface Plasmon Resonance Spectroscopy for Optical Constant Characterization and Potential Sensing Application: Theoretical and Experimental Approaches

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