CuTCNQ organic films were prepared separately by spontaneous charge transfer(CT) reaction of Cu with TCNQ in an acetonitrile or thermally activated solid phase diffusion and CT reaction of an alternative vapor depos...CuTCNQ organic films were prepared separately by spontaneous charge transfer(CT) reaction of Cu with TCNQ in an acetonitrile or thermally activated solid phase diffusion and CT reaction of an alternative vapor deposition of Cu and TCNQ thin films. The m展开更多
Since R. S. Potember and his co-operators reported in 1979 that there was a cur-rent-controlled bistable electrical switching phenomenon in the copper charge-transfer (CT)comples of 7, 7’, 8, 8’-tetracyanoquinodimet...Since R. S. Potember and his co-operators reported in 1979 that there was a cur-rent-controlled bistable electrical switching phenomenon in the copper charge-transfer (CT)comples of 7, 7’, 8, 8’-tetracyanoquinodimethane (TCNQ), electric, optoelectronic threshold-switching and memory effects have been found in succession within the copper and silverCT complexes of TCNQ and its derivatives. These potential characteristics usually corre-spond to a field-induced partial phase transition in material that generates either a展开更多
The development of heterogeneous catalysts with a well-defined micro structure to promote their activity and stability for electrocatalyfic CO2 reduction has been shown to be a promising strategy. In this work, Cu nan...The development of heterogeneous catalysts with a well-defined micro structure to promote their activity and stability for electrocatalyfic CO2 reduction has been shown to be a promising strategy. In this work, Cu nanoparticles （- 4 nm in diameter） embedded in N-doped carbon （Cu@NC） arrays were fabricated by thermal decomposition of copper tetracyanoquinodimethane （CuTCNQ） under N2. Compared to polycrystalline copper electrodes, the Cu@NC arrays provide a significantly improved number of catalytically active sites. This resulted in a 0.7 V positive shift in onset potential, producing a catalytic current density an order magnitude larger at a potential of -2.7 V vs. Fc/Fc＋ （Fc = ferrocene） in dimethylformamide （DMF）. By controlling the water content in the DMF solvent, the CO2 reduction product distribution can be tuned. Under optimal conditions （0.5 vol.% water）, 64% HCOO^-, 20% CO, and 13% H2 were obtained. The Cu@NC arrays exhibited excellent catalytic stability with only a 0.5% decrease in the steady-state catalytic current during 6 h of electrolysis. The three-dimensional （3D） array structure of the Cu@NC was demonstrated to be effective for improving the catalytic activity of copper based catalysts while maintaining long-term catalytic stability.展开更多
Two simple methods have been demonstrated to obtain large area,single crystalline lamellae of copper-7,7,8,8-tetracyanoquinodimethane(CuTCNQ).The formation of the lamellae was a result of fine tuning of the processes ...Two simple methods have been demonstrated to obtain large area,single crystalline lamellae of copper-7,7,8,8-tetracyanoquinodimethane(CuTCNQ).The formation of the lamellae was a result of fine tuning of the processes during the synthesis processes of CuTCNQ phase II.This facile synthesis of large area single crystalline lamellae suggests bright prospects for the study and understanding of the electrical switching of CuTCNQ by using single crystals of its phase II,and future applications of the material in memory and switching devices.展开更多
The organic single-crystal field-effect transistors using anthracene derivative, H-Ant as an active layer with source/drain electrodes decorated by metal charge transfer salt(Cu TCNQ) were fabricated. We demonstrated ...The organic single-crystal field-effect transistors using anthracene derivative, H-Ant as an active layer with source/drain electrodes decorated by metal charge transfer salt(Cu TCNQ) were fabricated. We demonstrated that this bottom-contact structure displayed an obvious improvement in the electrical characteristics relative to their pristine copper and top-contact gold electrode counterparts. This observation could be ascribed to the lower contact resistance resulting from the energetic match between electrodes and semiconductor.展开更多
文摘CuTCNQ organic films were prepared separately by spontaneous charge transfer(CT) reaction of Cu with TCNQ in an acetonitrile or thermally activated solid phase diffusion and CT reaction of an alternative vapor deposition of Cu and TCNQ thin films. The m
基金Project supported by the National Natural Science Foundation of China and the SFE.
文摘Since R. S. Potember and his co-operators reported in 1979 that there was a cur-rent-controlled bistable electrical switching phenomenon in the copper charge-transfer (CT)comples of 7, 7’, 8, 8’-tetracyanoquinodimethane (TCNQ), electric, optoelectronic threshold-switching and memory effects have been found in succession within the copper and silverCT complexes of TCNQ and its derivatives. These potential characteristics usually corre-spond to a field-induced partial phase transition in material that generates either a
文摘The development of heterogeneous catalysts with a well-defined micro structure to promote their activity and stability for electrocatalyfic CO2 reduction has been shown to be a promising strategy. In this work, Cu nanoparticles （- 4 nm in diameter） embedded in N-doped carbon （Cu@NC） arrays were fabricated by thermal decomposition of copper tetracyanoquinodimethane （CuTCNQ） under N2. Compared to polycrystalline copper electrodes, the Cu@NC arrays provide a significantly improved number of catalytically active sites. This resulted in a 0.7 V positive shift in onset potential, producing a catalytic current density an order magnitude larger at a potential of -2.7 V vs. Fc/Fc＋ （Fc = ferrocene） in dimethylformamide （DMF）. By controlling the water content in the DMF solvent, the CO2 reduction product distribution can be tuned. Under optimal conditions （0.5 vol.% water）, 64% HCOO^-, 20% CO, and 13% H2 were obtained. The Cu@NC arrays exhibited excellent catalytic stability with only a 0.5% decrease in the steady-state catalytic current during 6 h of electrolysis. The three-dimensional （3D） array structure of the Cu@NC was demonstrated to be effective for improving the catalytic activity of copper based catalysts while maintaining long-term catalytic stability.
基金from the National Natural Science Foundation of China(20721061,20872146,50725311)the Ministry of Science and Technology of China and the Chinese Academy of Sciences.
文摘Two simple methods have been demonstrated to obtain large area,single crystalline lamellae of copper-7,7,8,8-tetracyanoquinodimethane(CuTCNQ).The formation of the lamellae was a result of fine tuning of the processes during the synthesis processes of CuTCNQ phase II.This facile synthesis of large area single crystalline lamellae suggests bright prospects for the study and understanding of the electrical switching of CuTCNQ by using single crystals of its phase II,and future applications of the material in memory and switching devices.
基金supported by the National Natural Science Foundation of China(20721061,51033006,51003107,91027043)the China-Denmark Co-project,TRR61(NSFC-DFG Transregio Project)the National Basic Research Program of China(2011CB808400,2011CB932300,2009CB930400)and Chinese Academy of Sciences
文摘The organic single-crystal field-effect transistors using anthracene derivative, H-Ant as an active layer with source/drain electrodes decorated by metal charge transfer salt(Cu TCNQ) were fabricated. We demonstrated that this bottom-contact structure displayed an obvious improvement in the electrical characteristics relative to their pristine copper and top-contact gold electrode counterparts. This observation could be ascribed to the lower contact resistance resulting from the energetic match between electrodes and semiconductor.
