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Phase tuned synthesis of titanium dioxide nanoparticles for room temperature enhanced ammonia detection

机译：用于室温增强氨检测的二氧化钛纳米粒子的相调谐合成

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Synthesis of titanium dioxide nanoparticles is gaining more importance in the field of nanotechnology due to their application in the gas/vapor sensing field. The present study deals with the synthesis of titanium dioxide nanoparticles from titanium isopropoxide solution using various ionic liquids as phase tuning agents. XRD results revealed the crystalline nature and presence of anatase and rutile phases of synthesized titanium dioxide nanoparticles. The shape and size of the particles were analyzed using TEM and SEM images, which indicated their morphology. The adhesion of dip-coated thin films was obtained from contact angle measurements and correlated with surface roughness. The gas sensing ability of the synthesized titanium dioxide nanoparticles was tested by checking the level of chemisorption and measuring the change in resistance of the samples in the presence and absence of gas inside an airtight chamber and plotting it as a function of time. The sensing studies performed on the samples showed that the TiO2 samples with ionic liquid 1-ethyl-3-methylimidazolium hexafluorophosphate [EMIM·PF6], with the highest anatase phase percentage, displayed the best ammonia sensing. The results suggest that the sol–gel prepared TiO2 acts as an excellent gas sensor and on adding ionic liquid, the performance is further enhanced.
机译：由于二氧化钛纳米颗粒在气体/蒸气感测领域中的应用，因此其在纳米技术领域的重要性日益提高。本研究涉及使用各种离子液体作为相调节剂从异丙醇钛溶液中合成二氧化钛纳米颗粒。 XRD结果揭示了合成的二氧化钛纳米颗粒的晶体性质以及锐钛矿和金红石相的存在。使用TEM和SEM图像分析了颗粒的形状和大小，表明了它们的形态。通过接触角测量获得浸涂薄膜的粘附力，并与表面粗糙度相关。通过检查化学吸附水平并测量在密闭室内是否存在气体的情况下样品的电阻变化并将其绘制为时间的函数，来测试合成的二氧化钛纳米颗粒的气体感测能力。对样品进行的感测研究表明，TiO 2 样品与离子液体1-乙基-3-甲基咪唑六氟磷酸盐[EMIM·PF 6 < / sub> ]，锐钛矿相百分比最高，氨感最佳。结果表明，溶胶-凝胶法制备的TiO 2 是一种优良的气体传感器，加入离子液体后，性能进一步提高。

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