Lili Sun

Bulk-limited electrical behaviors in metal/hydrogenated diamond-like carbon/metal devices

Regardless of used metal contact combinations, bulk-limited electrical behaviors were observed in metal/hydrogenated diamond-like carbon (DLC)/metal (MSM) devices through the study of I-V curves and temperature dependence of conductivity. For MSM devices with DLC deposited at a substrate bias of −50u2009V, the I-V curves exhibited ohmic electrical behaviors in the range of 0–1u2009V and followed the Poole-Frenkel mechanism in the range of 1–5u2009V. Moreover, the carrier transport was dominated by the thermally activated process with an activation energy of 0.1576u2009eV in the temperature range of 160–400u2009K. The bulk-limited behaviors of MSM devices could be attributed to the relatively high bulk resistance of the DLC layer. This result offers the fundamental insight into DLC based electrical devices and brings forward the concept to fabricate functional carbon based materials.Regardless of used metal contact combinations, bulk-limited electrical behaviors were observed in metal/hydrogenated diamond-like carbon (DLC)/metal (MSM) devices through the study of I-V curves and temperature dependence of conductivity. For MSM devices with DLC deposited at a substrate bias of −50u2009V, the I-V curves exhibited ohmic electrical behaviors in the range of 0–1u2009V and followed the Poole-Frenkel mechanism in the range of 1–5u2009V. Moreover, the carrier transport was dominated by the thermally activated process with an activation energy of 0.1576u2009eV in the temperature range of 160–400u2009K. The bulk-limited behaviors of MSM devices could be attributed to the relatively high bulk resistance of the DLC layer. This result offers the fundamental insight into DLC based electrical devices and brings forward the concept to fabricate functional carbon based materials.

Preparation and Hydrophobic Properties of Diamond-like Carbon Films on PET Substrates

In order to achieve hydrophobic properties and good wear resistance of PET materials, diamond-like carbon films were deposited on PET substrates by linear ion beam (LIS) technology with varying ion beam current. The microstructure, morphology and wettability were analyzed, and the relationship between wetting behavior and surface morphology, microstructure, surface energy was investigated. The results show that the deposited diamondlike carbon film is typical amorphous carbon, its sp/sp increased from 0.774 to 1.622 with increase of LIS current, which indicated the increased graphitization. Meanwhile, the water contact angle of PET increased from 63.51° to 103.7°. Further analysis found that the hydrophobicity can be attributed to the enhanced graphitization and formation of nano-micro structure, which could result in a decrease of surface energy. In addition, the transmissivity in visible light range of PET could reach to over 88.5% , which showed an enhanced effect within the range of 500~760 nm. Therefore, controlling proper surface morphology and low surface energy by plasma modification technol资助项目 国家国际科技合作专项(2014DFG52430) 收稿日期 2016-06-11 定稿日期 2016-09-27 作者简介 孙丽丽,女,1984年生,工程师,博士生 通讯作者 汪爱英,研究员,aywang@nimte.ac.cn,研究方向为表面强化技术 DOI 10.11901/1005.3093.2016.323