To prolong the service life of optics,the feasibility of in situ cleaning of the multilayer mirror(MLM)of tin and its oxidized contamination was investigated using hydrogen plasma at different power levels.Granular ti...To prolong the service life of optics,the feasibility of in situ cleaning of the multilayer mirror(MLM)of tin and its oxidized contamination was investigated using hydrogen plasma at different power levels.Granular tin-based contamination consisting of micro-and macroparticles was deposited on silicon via physical vapor deposition(PVD).The electrodedriven hydrogen plasma at different power levels was systematically diagnosed using a Langmuir probe and a retarding field ion energy analyzer(RFEA).Moreover,the magnitude of the self-biasing voltage was measured at different power levels,and the peak ion energy was corrected for the difference between the RFEA measurements and the self-biasing voltage(E_(RFEA)-eV_(self)).XPS analysis of O 1s and Sn 3d peaks demonstrated the chemical reduction process after 1 W cleaning.Analysis of surface and cross-section morphology revealed that holes emerged on the upper part of the macroparticles while its bottom remained smooth.Hills and folds appeared on the upper part of the microparticles,confirming the top-down cleaning mode with hydrogen plasma.This study provides an in situ electrode-driven hydrogen plasma etching process for tin-based contamination and will provide meaningful guidance for understanding the chemical mechanism of reduction and etching.展开更多
Surface hydrophilization is required for numbers of applications such as biosensor,biomedical implants and marine coating.However,the preparation of hydrophilic surface from a solid substrate still suffers from limite...Surface hydrophilization is required for numbers of applications such as biosensor,biomedical implants and marine coating.However,the preparation of hydrophilic surface from a solid substrate still suffers from limited thicknesses,complex procedures,restricted substrates and harsh conditions.Herein,a method based on in-situ aminolysis of poly(pentafluorophenyl acrylate)(pPFPA)capable of generating arbitrary hydrophilic surface is proposed,enabling high design freedom and abundant choices of hydrophilic molecules.Simply immersing pPFPA coated substrates into 3-((3-aminopropyl)dimethylammonio)propane-1-sulfonate(ADPS),β-alanine and amine-terminal poly(ethylene glycol)(NH2-PEG)solutions for two hours drastically reduces the water contact angle of the corresponding surfaces,indicating the high efficiency and excellent generality of such method.Systematical studies reveal that these coatings are able to mitigate fog formation,self-clean the oil contaminant and exhibit excellent antifouling performance against algae.Notably,relying on the fast and quantitative feature of the aminolysis,these hydrophilic surfaces possess excellent regeneration capability and well-recover their hydrophilic feature after being physically damaged.This work represents a facile and universal way to fabricate versatile hydrophilic surfaces for multi-functional applications such as self-cleaning,patterning,sensing,antifogging and anti-biofouling.展开更多
Carbon-molybdenum disulfide(C-MoS_(2))ultrathin nanosheets were prepared by a hydrothermal process,and then Agl/C-MoS_(2) were synthesized via an/n-situ deposition method.This ternary heterojunction composite exhibite...Carbon-molybdenum disulfide(C-MoS_(2))ultrathin nanosheets were prepared by a hydrothermal process,and then Agl/C-MoS_(2) were synthesized via an/n-situ deposition method.This ternary heterojunction composite exhibited better photo-catalytic activity compared with those of one-component(pristine MoS_(2))and bicomponent(Agl/MoS_(2) and C-MoS_(2))materials for the degradation of organic dyes under the visible-light irradiation.In particular,by comparing with Agl/MoS_(2),the significant role of conductive amorphous carbon in Agl/C-MoS_(2) in enhancing the charge transfer during the photocatalytic degradation of dyes was first confirmed by photocurrent response and electrochemical impedance spectroscopy(EIS).A possible photocatalytic mechanism was proposed based on the capture experiment results.Furthermore,a straightforward and interesting way had been applied to test the recycled/newly-prepared Agl/C-MoS_(2) composite for revealing its distinctive self-cleaning performance and recyclability characteristic besides its good photocatalytic activity.This work could provide a reference for the design of other new ternary heterojunction composite materials with special structures and properties.展开更多
基金funded by the Institutional Research Fund from Sichuan University(No.2020SCUNL211)。
文摘To prolong the service life of optics,the feasibility of in situ cleaning of the multilayer mirror(MLM)of tin and its oxidized contamination was investigated using hydrogen plasma at different power levels.Granular tin-based contamination consisting of micro-and macroparticles was deposited on silicon via physical vapor deposition(PVD).The electrodedriven hydrogen plasma at different power levels was systematically diagnosed using a Langmuir probe and a retarding field ion energy analyzer(RFEA).Moreover,the magnitude of the self-biasing voltage was measured at different power levels,and the peak ion energy was corrected for the difference between the RFEA measurements and the self-biasing voltage(E_(RFEA)-eV_(self)).XPS analysis of O 1s and Sn 3d peaks demonstrated the chemical reduction process after 1 W cleaning.Analysis of surface and cross-section morphology revealed that holes emerged on the upper part of the macroparticles while its bottom remained smooth.Hills and folds appeared on the upper part of the microparticles,confirming the top-down cleaning mode with hydrogen plasma.This study provides an in situ electrode-driven hydrogen plasma etching process for tin-based contamination and will provide meaningful guidance for understanding the chemical mechanism of reduction and etching.
基金supported by the funding(E055AJ0101)from FJIRSM-CASNational Natural Science foundation of China(51803214)。
文摘Surface hydrophilization is required for numbers of applications such as biosensor,biomedical implants and marine coating.However,the preparation of hydrophilic surface from a solid substrate still suffers from limited thicknesses,complex procedures,restricted substrates and harsh conditions.Herein,a method based on in-situ aminolysis of poly(pentafluorophenyl acrylate)(pPFPA)capable of generating arbitrary hydrophilic surface is proposed,enabling high design freedom and abundant choices of hydrophilic molecules.Simply immersing pPFPA coated substrates into 3-((3-aminopropyl)dimethylammonio)propane-1-sulfonate(ADPS),β-alanine and amine-terminal poly(ethylene glycol)(NH2-PEG)solutions for two hours drastically reduces the water contact angle of the corresponding surfaces,indicating the high efficiency and excellent generality of such method.Systematical studies reveal that these coatings are able to mitigate fog formation,self-clean the oil contaminant and exhibit excellent antifouling performance against algae.Notably,relying on the fast and quantitative feature of the aminolysis,these hydrophilic surfaces possess excellent regeneration capability and well-recover their hydrophilic feature after being physically damaged.This work represents a facile and universal way to fabricate versatile hydrophilic surfaces for multi-functional applications such as self-cleaning,patterning,sensing,antifogging and anti-biofouling.
基金supported by the National Natural Science Foundation of China(Grant No.2187020207)the Laboratory Open Foundation of Qufu Normal University(No.sk201722).
文摘Carbon-molybdenum disulfide(C-MoS_(2))ultrathin nanosheets were prepared by a hydrothermal process,and then Agl/C-MoS_(2) were synthesized via an/n-situ deposition method.This ternary heterojunction composite exhibited better photo-catalytic activity compared with those of one-component(pristine MoS_(2))and bicomponent(Agl/MoS_(2) and C-MoS_(2))materials for the degradation of organic dyes under the visible-light irradiation.In particular,by comparing with Agl/MoS_(2),the significant role of conductive amorphous carbon in Agl/C-MoS_(2) in enhancing the charge transfer during the photocatalytic degradation of dyes was first confirmed by photocurrent response and electrochemical impedance spectroscopy(EIS).A possible photocatalytic mechanism was proposed based on the capture experiment results.Furthermore,a straightforward and interesting way had been applied to test the recycled/newly-prepared Agl/C-MoS_(2) composite for revealing its distinctive self-cleaning performance and recyclability characteristic besides its good photocatalytic activity.This work could provide a reference for the design of other new ternary heterojunction composite materials with special structures and properties.