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<p>The incorporation of noble metal nanoparticles with metal oxide nanofilms has demonstrated an enhancement in sensor performance as a result of their synergistic effects. In this regard, gold-sprayed tin dioxide nanofilms (AuNPs/SnO<sub>2</sub>-NF) were produced to serve as a pH-sensitive layer in extended-gate field-effect transistors (EGFET). The fabrication of the AuNPs/SnO<sub>2</sub>-NF was achieved using a one-step spray pyrolysis technique. During this process, SnCl<sub>2</sub>·2H<sub>2</sub>O was initially sprayed to create the SnO<sub>2</sub> layer, followed by the direct deposition of gold nanoparticles (AuNPs). A small quantity of AuNPs was deposited onto the surface of SnO<sub>2</sub> nanofilms (SnO<sub>2</sub>-NF) without completely covering it, resulting in the formation of AuNPs/SnO<sub>2</sub>-NF. The structural, morphological, surface roughness, and optical properties of the SnO<sub>2-</sub>NF and AuNPs/SnO<sub>2</sub>-NF were analyzed using a variety of techniques. The sensitivity, linearity, and hysteresis of the AuNPs/SnO<sub>2</sub>-NF sensing layer were evaluated for the pH-EGFET sensor on a pH scale ranging from 2 to 12. The findings revealed that the AuNPs/SnO<sub>2</sub>-NF exhibited a pH sensitivity characteristic of 62.1&#xa0;mV/pH, a linearity of 99.8%, and a hysteresis of 12&#xa0;mV. These results demonstrate significant improvements in both sensitivity and stability when compared to the unmodified SnO<sub>2</sub>-NF. The sensitivity of pH sensors is improved by the expansion of the active surface area and the enhancement of charge transfer by AuNPs on SnO<sub>2</sub>-NF. Furthermore, they stabilize the sensor's response by enhancing linearity through plasmonic effects. The results indicate that AuNPs/SnO<sub>2</sub>-NF has great potential for practical pH sensing applications.</p>

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Enhanced Performance of a pH-EGFET Sensor Based on Gold Nanoparticle-Decorated Tin Oxide (AuNPs-SnO2) Films Prepared by Spray Pyrolysis

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Lary H. Slewa,
  • Samira Yousif Asoka,
  • Nawroz Ismael Hassan,
  • Hazha Omar Othman,
  • Rebwar Omar Hassan

摘要

The incorporation of noble metal nanoparticles with metal oxide nanofilms has demonstrated an enhancement in sensor performance as a result of their synergistic effects. In this regard, gold-sprayed tin dioxide nanofilms (AuNPs/SnO2-NF) were produced to serve as a pH-sensitive layer in extended-gate field-effect transistors (EGFET). The fabrication of the AuNPs/SnO2-NF was achieved using a one-step spray pyrolysis technique. During this process, SnCl2·2H2O was initially sprayed to create the SnO2 layer, followed by the direct deposition of gold nanoparticles (AuNPs). A small quantity of AuNPs was deposited onto the surface of SnO2 nanofilms (SnO2-NF) without completely covering it, resulting in the formation of AuNPs/SnO2-NF. The structural, morphological, surface roughness, and optical properties of the SnO2-NF and AuNPs/SnO2-NF were analyzed using a variety of techniques. The sensitivity, linearity, and hysteresis of the AuNPs/SnO2-NF sensing layer were evaluated for the pH-EGFET sensor on a pH scale ranging from 2 to 12. The findings revealed that the AuNPs/SnO2-NF exhibited a pH sensitivity characteristic of 62.1 mV/pH, a linearity of 99.8%, and a hysteresis of 12 mV. These results demonstrate significant improvements in both sensitivity and stability when compared to the unmodified SnO2-NF. The sensitivity of pH sensors is improved by the expansion of the active surface area and the enhancement of charge transfer by AuNPs on SnO2-NF. Furthermore, they stabilize the sensor's response by enhancing linearity through plasmonic effects. The results indicate that AuNPs/SnO2-NF has great potential for practical pH sensing applications.