材料表面进行的纳米加工探索已经成为研究纳米尺度上的物理和化学现象的重要途径。大量实验数据表明，利用ＳＴＭ进行的表面纳米加工过程是同时受到强电场和高电流密度的作用而诱导的局部氧化或聚合反应等。在此，我们以石墨表面的纳米加工为例，发现在相似的实验条件下，纳米下陷结构的深度随加工脉冲时间的增长而显著增加，而该结构的表面直径变化则相对较小。这一结果为石墨表面纳米加工中可能发生的气化反应（化学反应）提供了直接证据 Exploration of nanofabrication on the surface of materials has become an important approach to the study of the physical and chemical phenomena at the nanoscale. A large number of experimental data show that the use of STM for surface nanofabrication process is also subject to strong electric field and high current density induced by the role of local oxidation or polymerization. Here, we take the nanofabrication of graphite as an example. It is found that under similar experimental conditions, the depth of the nanoscaled structure increases significantly with the increase of the processing pulse time. However, the surface diameter of the nanostructured nanostructures is relatively small. This result provides direct evidence of gasification reactions (chemical reactions) that may occur in nanofabrication of graphite surfaces