Abstract
In the present work, gold nanoparticles/indium tin oxide (AuNPs/ITO) thin films were analyzed for pH sensing application based on extended gate field-effect transistor (EGFET). The AuNPs were synthesized through pulsed laser ablation in liquid (PLAL) technique. Afterwards, the AuNPs were deposited onto ITO thin film by electrospinning method. The AuNPs were characterized using transmission electron microscope (TEM) and UV–Vis spectroscope techniques. From the TEM analysis, the size of the spherical-shaped AuNPs was found to be in the range of 5–22 nm. The UV–Vis spectroscopy analysis revealed absorption peak at 518 nm, indicating purplish red color. The AuNPs/ITO thin films were also characterized using field emission scanning electron microscope (FE-SEM) and X-Ray Photoelectron Spectroscopy (XPS) technique. The depth of the films was 6.498 µm and the Au 4f doublet binding energy peaks of the photoelectrons at 83.79 and 87.45 eV. The current–voltage (I-V) curves indicated pH sensitivities values of 43.6 mV/pH and 0.6 μA1/2pH−1 with linear regression of 0.99 and 0.99 for pH voltage and current sensitivities, respectively. The hysteresis and drift characteristics of the prepared films were also done to investigate the stability and reliability of the films. The results of this work demonstrated that the AuNPs/ITO thin film is quite useful for the acidity and basicity detection.
Highlights
The pH sensors have gained a great attention recently due to their demand in numerous applications including water treatment, medicine, agriculture, and food processing [1,2,3]
A great deal of effort relating to sensitivity improvement of the pH sensors has been carried out in order to enhance the sensitivity of the real-time monitoring of hydrogen ion concentration in a biochemical environment
This study presented the usage of Au NPs/indium tin oxide (ITO)/G membrane for pH sensing based on the extended gate field effect transistor (EGFET) platform
Summary
The pH sensors have gained a great attention recently due to their demand in numerous applications including water treatment, medicine , agriculture, and food processing [1,2,3]. A pH value is defined as the negative logarithm of hydrogen ions concentration H+ in the solution which indicates the hydrogen ion activity. A pH value determines whether the liquid is alkaline or acidic. The higher pH value indicates more alkaline liquid 4. The pH can be expressed by the following equation; pH = − log10[H+] (1). A great deal of effort relating to sensitivity improvement of the pH sensors has been carried out in order to enhance the sensitivity of the real-time monitoring of hydrogen ion concentration in a biochemical environment. Several techniques are being used to determine the pH values
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