An atmospheric pressure argon plasma brush with air addition is employed to treat polyethylene terephthalate(PET)surface in order to improve its hydrophilicity.Results indicate that the plasma plume generated by the p...An atmospheric pressure argon plasma brush with air addition is employed to treat polyethylene terephthalate(PET)surface in order to improve its hydrophilicity.Results indicate that the plasma plume generated by the plasma brush presents periodically pulsed current despite a direct current voltage is applied.Voltage-current curve reveals that there is a transition from a Townsend discharge regime to a glow one during one discharge period.Optical emission spectrum indicates that more oxygen atoms are produced in the plume with increasing air content,which leads to the better hydrophilicity of PET surface after plasma treatment.Besides,an aging behavior is also observed.The hydrophilicity improvement is attributed to the production of oxygen functional groups,which increase in number with increasing air content.Moreover,some grain-like structures are observed on the treated PET surface,and its mean roughness increases with increasing air content.These results are of great importance for the hydrophilicity improvement of PET surface with a large scale.展开更多
Plasma treatment and 10% NH_4OH solution rinsing were performed on a germanium(Ge) surface.It was found that the Ge surface hydrophilicity after O_2 and Ar plasma exposure was stronger than that of samples subjected...Plasma treatment and 10% NH_4OH solution rinsing were performed on a germanium(Ge) surface.It was found that the Ge surface hydrophilicity after O_2 and Ar plasma exposure was stronger than that of samples subjected to N_2 plasma exposure. This is because the thin Ge Ox film formed on Ge by O_2 or Ar plasma is more hydrophilic than Ge Ox Ny formed by N_2 plasma treatment. A flat(RMS 〈 0:5 nm) Ge surface with high hydrophilicity(contact angle smaller than 3°) was achieved by O_2 plasma treatment, showing its promising application in Ge low-temperature direct wafer bonding.展开更多
基金supported by National Natural Science Foundation of China(Nos.11875121,11575050 and51977057)the Midwest Universities Comprehensive Strength Promotion Project+4 种基金the Natural Science Foundation of Hebei Province,China(Nos.A2019201100,A2020201025)College Hundred Outstanding Innovative Talent Support Program of Hebei Education Bureau(No.SLRC2017021)Post-graduate’s Innovation Fund Project of Hebei Province(Nos.CXZZBS2019023,CXZZBS2019029)the Natural Science Interdisciplinary Research Program of Hebei University(No.DXK201908)Post-graduate’s Innovation Fund Project of Hebei University(No.HBU2021bs011)。
文摘An atmospheric pressure argon plasma brush with air addition is employed to treat polyethylene terephthalate(PET)surface in order to improve its hydrophilicity.Results indicate that the plasma plume generated by the plasma brush presents periodically pulsed current despite a direct current voltage is applied.Voltage-current curve reveals that there is a transition from a Townsend discharge regime to a glow one during one discharge period.Optical emission spectrum indicates that more oxygen atoms are produced in the plume with increasing air content,which leads to the better hydrophilicity of PET surface after plasma treatment.Besides,an aging behavior is also observed.The hydrophilicity improvement is attributed to the production of oxygen functional groups,which increase in number with increasing air content.Moreover,some grain-like structures are observed on the treated PET surface,and its mean roughness increases with increasing air content.These results are of great importance for the hydrophilicity improvement of PET surface with a large scale.
基金Project supported by the Key Project of Natural Science Foundation of China(No.61534005)the National Science Foundation of China(No.61474081)+2 种基金the National Basic Research Program of China(No.2013CB632103)the Natural Science Foundation of Fujian Province(No.2015D020)the Science and Technology Project of Xiamen City(No.3502Z20154091)
文摘Plasma treatment and 10% NH_4OH solution rinsing were performed on a germanium(Ge) surface.It was found that the Ge surface hydrophilicity after O_2 and Ar plasma exposure was stronger than that of samples subjected to N_2 plasma exposure. This is because the thin Ge Ox film formed on Ge by O_2 or Ar plasma is more hydrophilic than Ge Ox Ny formed by N_2 plasma treatment. A flat(RMS 〈 0:5 nm) Ge surface with high hydrophilicity(contact angle smaller than 3°) was achieved by O_2 plasma treatment, showing its promising application in Ge low-temperature direct wafer bonding.