The well-known high pressure high temperature (HPHT) method has been used for preparing diamond since 1986. This research introduces a new method for preparing diamond by using the global Hummer method after changing two main agents, namely, the frequency of ultrasound waves and the exposure time of these waves. The frequency was increased to 40 kHz, while the exposure time was increased to 2 h. It was found that applying the Hummer method on graphene oxide with an ultrasound exposure time of 20 min and 2 h can result in graphene oxide and nanodiamond (ND), respectively. The resulting ND began to grow after it was left for 10 days. The spectral properties of the diamond were characterized by using Ultraviolet-visible (UV-Vis) and Raman. The UV-Vis showed that the absorption peak at 220 nm is within the ultraviolet region, while the bandgap was found to be 5.6. The Raman confirmed the presence of the functional group for the diamond at 1332 cm⁻¹ wavenumber. Moreover, the morphology property of the diamond and stages of diamond formation have been visualized by using scanning electron microscope (SEM) and optical microscope.

自1986年以来，众所周知的高压高温（HPHT）方法已被用于制备钻石。本研究介绍了一种在改变两种主要因素（即超声波频率和这些波的曝光时间。频率增加到40 kHz，而曝光时间增加到2 h。已经发现，在超声暴露时间为20分钟和2小时的氧化石墨烯上应用Hummer方法可以分别产生氧化石墨烯和纳米金刚石（ND）。放置10天后，生成的ND开始生长。钻石的光谱特性通过使用紫外可见（UV-Vis）和拉曼光谱来表征。UV-Vis显示在220 nm处的吸收峰在紫外区域内，而带隙为5.6。拉曼证实在1332厘米处存在钻石的官能团^-1波数。此外，已经通过使用扫描电子显微镜（SEM）和光学显微镜观察了金刚石的形态特性和金刚石形成的阶段。