Chemical vapor deposition(CVD)graphene film is a promising electrode-modifying material for fabricating high-performance glucose sensor due to its high electrical conductivity and two-dimensional structure over large ...Chemical vapor deposition(CVD)graphene film is a promising electrode-modifying material for fabricating high-performance glucose sensor due to its high electrical conductivity and two-dimensional structure over large area.However,the use of typical metal-based CVD graphene suffers from the residue contamination of polymer transfer-support and heavy metal ions.In this work,we directly grew fewlayer graphene on the SiO2/Si substrate without transfer process and then fabricated graphene-based glucose sensors by sequentially immobilizing glucose oxidase and depositing Nafion layer on its surface that was functionalized by oxygen-plasma treatment.Our transfer-and metal-free process shows distinct advantage over the common metal-CVD method in improving the electrochemical performance by eliminating the contamination of transfer-residue.Thus-obtained glucose sensor shows a high sensitivity(16.16μA mM-1cm-2)with a detection limit of 124.19μM.This method is simple and promising for the development of highly sensitive glucose sensors.展开更多
In this paper we describe a new method to fabricate TiO2@C core-shell nanofiber arrays for electrochemical sensing.The TiO2@C nanofiber arrays have been produced directly on titanium surface under acetone vapor at 800...In this paper we describe a new method to fabricate TiO2@C core-shell nanofiber arrays for electrochemical sensing.The TiO2@C nanofiber arrays have been produced directly on titanium surface under acetone vapor at 800 ℃.This TiO2@C core-shell nanofiber arrays have the 40 nm TiO2 core in diameter and 5—10 nm carbon shell in thickness and show good electrochemical behaviors.The cyclic voltammogram in 1.0×10-3 mol/L K3Fe(CN)6 is quasi-reversible.The amperometric response increases linearly with the increase of the concentration of dopamine in the range of 1.0×10-7—1.0×10-4 mol/L.The detection limit(S/N=3)of dopamine is 2.45×10-8 mol/L.展开更多
The study of gas sensitivity of multi-wall carbon nanotubes (MWNTs), which is deposited by low press chemical vapor deposition (LPCVD), is presented. The results show that the pure MWNTs are not sensitive to the gases...The study of gas sensitivity of multi-wall carbon nanotubes (MWNTs), which is deposited by low press chemical vapor deposition (LPCVD), is presented. The results show that the pure MWNTs are not sensitive to the gases measured, while the composite film consisting of the MWNTs and silicon dioxide is sensitive to the methane, the hydrogen and the acetylene. The MWNTs and silicon dioxide composite film have the capacitance characteristic because of the formation of Schottky junctions within the MWNTs. The chemistry adsorption of the gas measured on the surface of the MWNTs affects the space discharge area of the Schottky junction, so that the dielectric constant changes with the gas concentration. That is why the gas is sensed.展开更多
基金financially supported by the Ministry of Science and Technology of China(Nos.2016YFA0200101 and 2016YFB04001104)the National Natural Science Foundation of China(Nos.51325205,51290273,51521091,51272256,61422406,51802317 and 61574143)+5 种基金the Chinese Academy of Sciences(Nos.KGZD-EW-303-1,KGZD-EW-303-3,KGZD-EW-T06 and XDPB06)the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDB30000000)the Liaoning Revitalization Talents Program(No.XLYC1808013)the Liaoning Key R&D Programthe Program for Guangdong Introducing Innovative and Enterpreneurial Teamsthe Development and Reform Commission of Shenzhen Municipality for the development of the“Low-Dimensional Materials and Devices”discipline.
文摘Chemical vapor deposition(CVD)graphene film is a promising electrode-modifying material for fabricating high-performance glucose sensor due to its high electrical conductivity and two-dimensional structure over large area.However,the use of typical metal-based CVD graphene suffers from the residue contamination of polymer transfer-support and heavy metal ions.In this work,we directly grew fewlayer graphene on the SiO2/Si substrate without transfer process and then fabricated graphene-based glucose sensors by sequentially immobilizing glucose oxidase and depositing Nafion layer on its surface that was functionalized by oxygen-plasma treatment.Our transfer-and metal-free process shows distinct advantage over the common metal-CVD method in improving the electrochemical performance by eliminating the contamination of transfer-residue.Thus-obtained glucose sensor shows a high sensitivity(16.16μA mM-1cm-2)with a detection limit of 124.19μM.This method is simple and promising for the development of highly sensitive glucose sensors.
文摘In this paper we describe a new method to fabricate TiO2@C core-shell nanofiber arrays for electrochemical sensing.The TiO2@C nanofiber arrays have been produced directly on titanium surface under acetone vapor at 800 ℃.This TiO2@C core-shell nanofiber arrays have the 40 nm TiO2 core in diameter and 5—10 nm carbon shell in thickness and show good electrochemical behaviors.The cyclic voltammogram in 1.0×10-3 mol/L K3Fe(CN)6 is quasi-reversible.The amperometric response increases linearly with the increase of the concentration of dopamine in the range of 1.0×10-7—1.0×10-4 mol/L.The detection limit(S/N=3)of dopamine is 2.45×10-8 mol/L.
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.50077016,60036010 and 60276037).
文摘The study of gas sensitivity of multi-wall carbon nanotubes (MWNTs), which is deposited by low press chemical vapor deposition (LPCVD), is presented. The results show that the pure MWNTs are not sensitive to the gases measured, while the composite film consisting of the MWNTs and silicon dioxide is sensitive to the methane, the hydrogen and the acetylene. The MWNTs and silicon dioxide composite film have the capacitance characteristic because of the formation of Schottky junctions within the MWNTs. The chemistry adsorption of the gas measured on the surface of the MWNTs affects the space discharge area of the Schottky junction, so that the dielectric constant changes with the gas concentration. That is why the gas is sensed.
