A co-flow premixed flat flame is applied to form MoO₃ nanobelts and nanoplatelets in the gas phase. An experimental study is conducted with a thermophoretic sampling particle diagnostic (TSPD) technique to reconstruct the evolution of nanostructure formation. In order to investigate the growth mechanism of the nanobelts and nanoplatelets, samples were directly taken along the centerline at different positions in the flame to represent the essential morphological variations of material. Based on the sample information collected by TEM, a growth mechanism of nanobelts and nanoplatelets is proposed. The results indicate that nanobelts and nanoplatelets with well-defined structure are successfully synthesized in premixed flame. The precursor temperature has a significant impact on the morphology by affecting the vapor concentration in the flame. For synthetic nanobelts, the intermediate particles tend to grow along a specific direction with small surface energy, and the final morphology is determined by particle attachment. In contrast, the initial growth of the nanoplatelets is mainly characterized by vapor surface deposition/growth, and the formation of the final morphology relies on the coalescence of large particles and small particles.

并流预混平焰施加以形成MoO ₃气相中的纳米带和纳米片。使用热泳采样粒子诊断（TSPD）技术进行了一项实验研究，以重建纳米结构形成的过程。为了研究纳米带和纳米片的生长机理，直接沿火焰中不同位置的中心线采集样品，以表示材料的基本形态变化。基于TEM收集的样品信息，提出了纳米带和纳米片的生长机理。结果表明，在预混火焰中成功合成了结构明确的纳米带和纳米片。前体温度通过影响火焰中的蒸气浓度，对形态产生重大影响。对于合成纳米带，中间粒子倾向于沿着特定的方向以较小的表面能生长，最终的形态取决于粒子的附着。相反，纳米片的初始生长主要以气相表面沉积/生长为特征，而最终形态的形成依赖于大颗粒和小颗粒的结合。