Titanium dioxide (TiO2) is a semiconductor that can be applied in different technological areas. In this work, we investigated the modifications of the electrical properties of thin films composed of TiO2 nanoparticles produced with different morphologies. The solvothermal route used for the synthesis allowed the production of nanoparticles with functionalized surfaces due to oleate groups. It was possible to modulate nanocrystals shape and size due to the detachment crystal growth mechanism, by changing the reaction time. Nanorods were obtained using 4 h of synthesis, and an increase in the reaction time to 64 h led to a bipyramidal morphology. The functionalization by the organic ligand allowed the preparation of stable colloidal solutions, which were used to prepare thin films by the dip-coating method. The films presented a homogeneous surface, an average thickness around 100 nm, and no agglomerations were observed. The electrical resistance measurements indicated a typical behavior of semiconductors, and they were dependent on the nanoparticle morphology. An exploratory test indicated that the thin films prepared using nanorod particles presented a higher electrical response compared with isotropic particles, when exposed in a liquefied petroleum gas vapor atmosphere. Therefore, the morphology of the nanoparticles is a key factor for the further application of these thin films in gas sensing. Employing an easy methodology which required simple apparatus, and by using reaction time modulation only, it was possible to prepare homogeneous thin films with a tunable electrical response.

二氧化钛（TiO 2）是可以应用于不同技术领域的半导体。在这项工作中，我们研究了由TiO 2组成的薄膜的电性能的变化具有不同形态的纳米颗粒。用于合成的溶剂热途径允许产生由于油酸酯基团而具有官能化表面的纳米颗粒。通过改变反应时间，可以通过脱离晶体的生长机理来调节纳米晶体的形状和大小。纳米棒是使用4小时的合成过程获得的，反应时间增加至64小时导致了双锥体的形态。通过有机配体的官能化可以制备稳定的胶体溶液，该胶体溶液用于通过浸涂法制备薄膜。膜呈现均匀的表面，平均厚度约为100 nm，未观察到团聚。电阻测量表明半导体的典型行为，并且它们取决于纳米颗粒的形态。一项探索性试验表明，当暴露在液化石油气蒸气气氛中时，与各向同性颗粒相比，使用纳米棒颗粒制备的薄膜具有更高的电响应。因此，纳米颗粒的形态是这些薄膜在气体传感中进一步应用的关键因素。采用需要简单设备的简单方法，并且仅通过使用反应时间调制，就可以制备具有可调电响应的均匀薄膜。纳米颗粒的形态是这些薄膜在气体传感中进一步应用的关键因素。采用需要简单设备的简单方法，并且仅通过使用反应时间调制，就可以制备具有可调电响应的均匀薄膜。纳米颗粒的形态是这些薄膜在气体传感中进一步应用的关键因素。采用需要简单设备的简单方法，并且仅通过使用反应时间调制，就可以制备具有可调电响应的均匀薄膜。