Abstract In this study, nanocomposite of V2O5 nanowires with noble metal (Au, Ag, and Pd) nanoparticles were fabricated by solution mixing and hydrothermal synthesis. These nanomaterials were analysed for their sensing properties towards Helium gas. Experiments carried out at room temperature conditions showed that V-Ag composite yielded the highest percentage response (73% at 150 ppm) and fast response/recovery times (8s/13 s at 100 ppm). The highest electrical conductivity of Ag nanoparticle was attributed as the principle reason behind the ultra-high response of V-Ag composite. The temperature dependent n- to p-type transition of the semiconducting material was also observed at higher sensing temperatures which was validated through Hall Effect measurements. The majority charge carrier transition from n- to p-type was observed near 47 °C. The highest response of V-Ag nanocomposite was recorded (108% at 5 ppm) at 100 °C when the material behaved like a p-type semiconductor.

中文翻译：

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通过 V2O5-贵金属（Au、Ag 和 Pd）纳米复合材料增强 He 气体检测，具有温度依赖的 n 型到 p 型转变

摘要 在本研究中，通过溶液混合和水热合成制备了 V2O5 纳米线与贵金属（Au、Ag 和 Pd）纳米颗粒的纳米复合材料。分析了这些纳米材料对氦气的传感特性。在室温条件下进行的实验表明，V-Ag 复合材料产生了最高的响应百分比（150 ppm 时为 73%）和快速响应/恢复时间（100 ppm 时为 8 秒/13 秒）。Ag纳米粒子的最高电导率被认为是V-Ag复合材料超高响应背后的主要原因。在更高的传感温度下也观察到半导体材料的温度相关的 n 型到 p 型转变，这通过霍尔效应测量得到了验证。在 47 °C 附近观察到多数载流子从 n 型到 p 型的转变。