5:30 PM - 5:45 PM
▲ [5p-A410-13] Surface Plasmon Resonance and Molecular Imprinting Polymer based Fiber Optic Dicloran Sensor
Keywords:Fiber optic, Sensor, Surface plasmon resonance
Dicloran (2,6-dichloro-4-nitroaniline), a chlorinated nitroaniline fungicide, is used to prevent the different crops from fungal spore germination. According to studies, excess of fungicides is very dangerous for human health as well as for the environment and causes many diseases such as birth defects, neurological disorders, liver damage, cancer and hormone disruption. Therefore, a quick, low cost and highly sensitive sensor is required for the detection of dicloran. The aim of this work is designing of a highly selective sensor to determine the dicloran in biological and environmental samples.
We report a surface plasmon resonance (SPR) based fiber optic sensor for dicloran detection utilizing molecularly imprinted polymer (MIP) film over silver layer coated unclad core of an optical fiber. Surface plasmons are the charge density oscillations at the metal-dielectric interface and can be excited by p-polarized light. In the wavelength interrogation method with fixed angle of incidence, a maximum amount of incident light is transferred to surface plasmons at a particular wavelength called as resonance wavelength. This occurs when the wave vector of incident light matches with the wave vector of the surface plasmons which results in the excitation of surface plasmons. This phenomenon is known as surface plasmon resonance. Thus, at a resonance wavelength, a dip is observed in the transmission spectrum which is very sensitive to the refractive index of the dielectric medium in contact of metal layer. Molecular imprinting is a technique which is used for the selective identification of template molecules. In this technique, artificial binding sites are formed in a polymer matrix which are complementary in shape and size to the template molecule. These binding sites are used for the recognition of template molecules. When the template molecule comes in the contact of MIP layer the template starts settle down to the cavity which causes the change in the refractive index of the polymer/sensing layer. The proposed sensor has high sensitivity and high selectivity and has numerous other advantages like the ease of handling, fast response, free from electrical isolation, low cost and capability of online monitoring and remote sensing.
We report a surface plasmon resonance (SPR) based fiber optic sensor for dicloran detection utilizing molecularly imprinted polymer (MIP) film over silver layer coated unclad core of an optical fiber. Surface plasmons are the charge density oscillations at the metal-dielectric interface and can be excited by p-polarized light. In the wavelength interrogation method with fixed angle of incidence, a maximum amount of incident light is transferred to surface plasmons at a particular wavelength called as resonance wavelength. This occurs when the wave vector of incident light matches with the wave vector of the surface plasmons which results in the excitation of surface plasmons. This phenomenon is known as surface plasmon resonance. Thus, at a resonance wavelength, a dip is observed in the transmission spectrum which is very sensitive to the refractive index of the dielectric medium in contact of metal layer. Molecular imprinting is a technique which is used for the selective identification of template molecules. In this technique, artificial binding sites are formed in a polymer matrix which are complementary in shape and size to the template molecule. These binding sites are used for the recognition of template molecules. When the template molecule comes in the contact of MIP layer the template starts settle down to the cavity which causes the change in the refractive index of the polymer/sensing layer. The proposed sensor has high sensitivity and high selectivity and has numerous other advantages like the ease of handling, fast response, free from electrical isolation, low cost and capability of online monitoring and remote sensing.