Wavelength Dependent Ammonia Sensing Characteristics of SnO2 based Fiber Optic Sensor

2nd International Conference on Materials Science and Technology

Narasimman, S.^1 ; Balakrishnan, L.^2 ; Meher, S.R.^3 ; Sivacoumar, R.^4 ; Rufus, Elizabeth^4 ; Alex, Z.C.^4

School of Electronics Engineering, VIT University, Vellore

632 014, India^1

Department of Physics, Government College of Technology, Coimbatore

641 013, India^2

Department of Physics, School of Advanced Sciences, VIT University, Vellore

632 014, India^3

Department of Sensor and Biomedical Technology, School of Electronics Engineering, VIT University, Vellore

632 014, India^4

关键词: Ammonia sensing;    Blue wavelength;    Diffused reflectance;    High sensitivity;    Nano powders;    SnO2;    Tetragonal structure;    Wavelength ranges;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/360/1/012055/pdf
DOI  :  10.1088/1757-899X/360/1/012055

来源: IOP

【 摘 要 】

SnO2 nanoparticles were synthesized by co-precipitation technique. The synthesized SnO2 nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and UV-visible diffused reflectance spectrometer (DRS). The XRD results addressed that the SnO2 nanoparticles was crystallized in rutile tetragonal structure. The SEM analysis confirms that the prepared nanopowder is composed of nanoparticles. Analysis of the DRS UV-Vis spectrum showed that the band gap of the synthesized SnO2 is to be ∼3.4 eV. The small cladding portion of the optical fiber was replaced with the synthesized nanoparticles. The ammonia sensing characteristics of the prepared SnO2 nanoparticles were analyzed for different wavelength ranges (red, yellow and blue) using polymethyl methacrylate fiber. It has been found that the synthesized SnO2 nanoparticles shows high sensitivity (∼23) in yellow wavelength range compared with red and blue wavelength ranges at room temperature.