Selectivity towards methyl mercaptan of Pt-PtO functionalized WO3 nanostructures made by flame spray pyrolysis

IF 4.1 Q1 CHEMISTRY, ANALYTICAL

Talanta Open Pub Date : 2025-04-29 DOI:10.1016/j.talo.2025.100464

Kanittha Inyawilert , Matawee Punginsang , Chonlada Dechakiatkrai Theerakarunwong , Anurat Wisitsoraat , Chaikarn Liewhiran

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Abstract

This work presented 0–1 wt% Pt-PtO functionalized WO₃ nanostructures synthesized by flame spray pyrolysis (FSP) for methyl mercaptan (CH₃SH)-sensing applications. According to electron microscopic and X-ray spectroscopic analysis, 1–3 nm Pt-PtO core-shell nanoparticles were decorated on 5–20 nm primary monoclinic WO₃ nanoparticles. The gas-sensing data revealed that Pt-PtO loading with an optimum Pt content of 0.5 wt% provided a remarkably enhanced CH₃SH response of 204 to 500 ppb CH₃SH at the best sensing temperature of 250°C with a low detection limit of 26 ppb and high CH₃SH selectivity relative to (CH₃)₂S, H₂S, CH₃OH, C₂H₅OH, C₃H₆O, NH₃, NO₂, H₂, CH₄, C₂H₂ and short-chain fatty acids (SCFAs) including CH₃COOH, C₂H₅COOH, C₃H₇COOH. Therefore, the flame-synthesized Pt-PtO functionalized WO₃ nanosensors could be potential for CH₃SH detection at ppb levels in the medical applications particularly noninvasive breath diagnosis of halitosis and serious infection of periodontitis.

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火焰喷雾热解制备Pt-PtO功能化WO3纳米结构对甲基硫醇的选择性

采用火焰喷雾热解法（FSP）合成了wt%为0-1的Pt-PtO功能化WO3纳米结构，用于甲基硫醇（CH3SH）传感。电镜和x射线光谱分析表明，将1 ~ 3 nm Pt-PtO核壳纳米粒子修饰在5 ~ 20 nm原生单斜WO3纳米粒子上。气敏实验结果表明，Pt- pto的最佳Pt含量为0.5 wt%，在250℃的最佳感应温度下，其CH3SH响应量为204 ~ 500 ppb，检测限低至26 ppb，相对于（CH3）2S、H2S、CH3OH、C2H5OH、c3h60、NH3、NO2、H2、CH4、C2H2和短链脂肪酸（包括CH3COOH、C2H5COOH、C3H7COOH）具有较高的CH3SH选择性。因此，火焰合成的Pt-PtO功能化WO3纳米传感器有可能用于ppb水平的CH3SH检测，特别是在口臭和严重牙周炎感染的无创呼吸诊断中。

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