多功能氧化物纳米片：二维Ga₂O₃的摩擦、霍尔与压电形变
Multifunctional Oxide Nanosheets: Frictional, Hall, and Piezoelectric Deformation of 2D Ga2O3
AI总结：
本研究针对二维氧化物多功能特性研究不足的问题，采用多种AFM技术探究β-Ga₂O₃纳米片的摩擦、输运及机电特性，揭示其偏压可调摩擦、超宽禁带及缺陷诱导压电响应等特性，为多功能氧化物纳米器件提供新平台。
摘要：
原子级厚度的氧化物日益被视为一类新兴二维材料，但与其他层状材料相比，其多功能特性的研究仍远远不足。其中，氧化镓凭借超宽禁带、热稳定性和机械刚性脱颖而出，是纳机电系统的候选材料。本研究采用基于原子力显微镜（AFM）的技术，探究了β-Ga₂O₃纳米片的摩擦学、输运及机电特性。研究利用摩擦力显微镜（FFM）研究界面滑动，观察到摩擦对外加偏压的依赖关系，这一现象归因于缺陷介导的电荷俘获。研究在最高400℃的条件下开展了范德堡霍尔测量，证实了β-Ga₂O₃的超宽禁带特性——尽管存在高热激活，电子输运仍受到抑制。研究进一步采用压电力显微镜（PFM），检测到量级约为几pm/V的可测逆机电响应，这与氧空位诱导的对称性破缺一致。通过整合摩擦学、电学和机电测量，本研究证明β-Ga₂O₃纳米片提供了一个独特平台，兼具绝缘稳定性、偏压可调的界面力学特性以及缺陷赋能的机电活性，为多功能氧化物纳米器件带来了新机遇。
英文摘要：
Atomically thin oxides are increasingly recognized as an emerging class of 2D materials, yet their multifunctional properties have been far less investigated compared to other layered materials. Among these, gallium oxide is distinguished by its ultrawide bandgap, thermal stability, and mechanical rigidity, positioning it as a candidate material for nanoelectromechanical systems. In this study, the tribological, transport, and electromechanical properties of beta-Ga2O3 nanosheets were probed using atomic force microscopy (AFM)--based techniques. Friction force microscopy (FFM) was used to investigate interfacial sliding, and a dependence of friction on external bias was observed, which was attributed to defect-mediated charge trapping. Van der Pauw Hall measurements were conducted up to 400 $^{\circ}$C, through which the ultrawide bandgap nature of beta-Ga2O3 was confirmed, as electronic transport remained suppressed despite high thermal activation. Piezoresponse force microscopy (PFM) was further applied, and a measurable converse electromechanical response on the order of a few pm/V was revealed, consistent with oxygen-vacancy--induced symmetry breaking. By integrating tribological, electrical, and electromechanical measurements, it was demonstrated that beta-Ga2O3 nanosheets present a unique platform in which insulating stability, bias-tunable interfacial mechanics, and defect-enabled electromechanical activity coexist, offering new opportunities for multifunctional oxide nanodevices.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
