The major goal of this work is to fabricate a chemiresistive sensor using the properties of nanostructured tungsten trioxide (WO₃) doped polyaniline (PAni) nanocomposite to detect malaria biomarker volatile organic compounds (VOCs). The nanocomposite with a mixed morphology of fibers and rod-shaped particles is synthesized using a chemical polymerization method. The mixed morphology of the particles provided a large surface area and porous structure to the nanocomposite and hence more ‘target trap zones’ were formed in the sensing layer to produce a drastic change in resistance while sensing a target VOC vapour. The morphological and structural characterization of the nanocomposite was done using FESEM, XRD and FT-IR methods. Electrical and dielectric studies was performed to study the transport properties of the WO₃ doped polyaniline nanocomposite at room temperature. The thermal stability characteristics of the nanocomposite was analyzed using TGA (Thermogravimetric analysis). The sensing studies of the drop casted sensors using the nanocomposites were done and sensing and selectivity characteristics were plotted. The sensor showed good selectivity towards the target VOCs. The sensor with a doping concentration of 15% WO₃ in the polyaniline matrix has shown a better response and recovery towards the malaria biomarkers 3-Carene and α-Pinene. The sensor can be used to develop a handheld portable device for malaria biomarker detection from human breath.

这项工作的主要目标是利用纳米结构的三氧化钨（WO ₃）掺杂聚苯胺（PAni）纳米复合材料，以检测疟疾生物标志物的挥发性有机化合物（VOC）。使用化学聚合法合成具有纤维和棒状颗粒的混合形态的纳米复合材料。颗粒的混合形态为纳米复合材料提供了较大的表面积和多孔结构，因此在感应层中形成了更多的“目标陷阱区”，从而在感应目标VOC蒸气时产生了电阻的急剧变化。使用FESEM，XRD和FT-IR方法对纳米复合材料进行了形态和结构表征。进行了电学和介电研究以研究WO ₃的传输性质室温下掺杂聚苯胺纳米复合材料。使用TGA（热重分析）分析纳米复合材料的热稳定性特征。使用纳米复合材料对滴铸传感器进行了传感研究，并绘制了传感和选择性特征。传感器对目标VOC表现出良好的选择性。聚苯胺基质中掺杂浓度为15％WO ₃的传感器对疟疾生物标记物3-Carene和α-Pinene表现出更好的响应和恢复。该传感器可用于开发手持便携式设备，用于从人的呼吸中检测疟疾生物标志物。