Here we present an easy one-step approach to pattern uniform catalyst lines for the growth of dense,aligned parallel arrays of single-walled carbon nanotubes(SWNTs)on quartz wafers by using photolithography or polydim...Here we present an easy one-step approach to pattern uniform catalyst lines for the growth of dense,aligned parallel arrays of single-walled carbon nanotubes(SWNTs)on quartz wafers by using photolithography or polydimethylsiloxane(PDMS)stamp microcontact printing(μCP).By directly doping an FeCl3/methanol solution into Shipley 1827 photoresist or polyvinylpyrrolidone(PVP),various catalyst lines can be well-patterned on a wafer scale.In addition,during the chemical vapor deposition(CVD)growth of SWNTs the polymer layers play a very important role in the formation of mono-dispersed nanoparticles.This universal and effi cient method for the patterning growth of SWNTs arrays on a surface is compatible with the micro-electronics industry,thus enabling of the fabrication highly integrated circuits of SWNTs.展开更多
A procedure for purification of single walled carbon nanotubes(SWNTs) grown by the chemical vapour deposition(CVD) of carbon monooxide has been developed. Based on the result from TGA/DTA of as prepared sample, the ...A procedure for purification of single walled carbon nanotubes(SWNTs) grown by the chemical vapour deposition(CVD) of carbon monooxide has been developed. Based on the result from TGA/DTA of as prepared sample, the oxidation temperature was determined. The process included sonication, oxidation and acid washing steps. The purity and yield after purification were determined and estimated by TEM. Moreover, for the first time, a loop structure for CVD SWNTs has been observed.展开更多
Field effect transistors (FET) based on Single-Walled Carbon Nanotubes (SWNTs) become the hot topic in fields of nano-electronic, clinical diagnostics, environmental testing etc. in recent years. In this paper, we rep...Field effect transistors (FET) based on Single-Walled Carbon Nanotubes (SWNTs) become the hot topic in fields of nano-electronic, clinical diagnostics, environmental testing etc. in recent years. In this paper, we reported a simple, scalable way to enrich semiconducting SWNTs by using HNO3/H2SO4. Then carbon nanotube field-effect transistors (CNTFET) biosensor was fabricated with the enrichment SWNTs for Escherichia coli O157︰H7 detection. The response of each CNTFET was monitored in real time before and after introduction of the Escherichia coli O157︰H7 at various concentrations. The results show that CNT-FET biosensors we fabricated are sensitive to change of concentration of solution and response time is really short.展开更多
Carbon nanotubes （CNTs） were extensively explored for their beneficial use in nervous system tissue engineering. However, an important concern regarding the use of CNTs is their toxicity during the interaction betwe...Carbon nanotubes （CNTs） were extensively explored for their beneficial use in nervous system tissue engineering. However, an important concern regarding the use of CNTs is their toxicity during the interaction between cells and the nano particles. The rat pheochromocytoma cell line （PC12） was co-cultured with three types of single-walled carbon nanotubes （SWNTs）, purified raw SWNTs （C）, hydroxyl purified SWNTs （C-OH） and carboxyl purified SWNTs （C-COOH） at 25 μg/mL and 100 μg/ml. The experimental results revealed that SWNTs at the concentration below 100 μg/mL did not affect the cell viability. Notably, powerful antioxidant system in nerous system tissue is able to counteract with the toxicity of CNTs, which is characterized by the prominently enhanced expression of main antioxidant enzymes （catalase （CAT）, superoxide dismutase （SOD）, glutathione peroxidase （GPx） and glutathione-S-transferase （GST））. Therefore, we believe that CNTs can be good candidates for the fabrication of biomedical scaffolds for the nerve tissue repair.展开更多
基金by the Army Research Office and the Office of Naval Research.
文摘Here we present an easy one-step approach to pattern uniform catalyst lines for the growth of dense,aligned parallel arrays of single-walled carbon nanotubes(SWNTs)on quartz wafers by using photolithography or polydimethylsiloxane(PDMS)stamp microcontact printing(μCP).By directly doping an FeCl3/methanol solution into Shipley 1827 photoresist or polyvinylpyrrolidone(PVP),various catalyst lines can be well-patterned on a wafer scale.In addition,during the chemical vapor deposition(CVD)growth of SWNTs the polymer layers play a very important role in the formation of mono-dispersed nanoparticles.This universal and effi cient method for the patterning growth of SWNTs arrays on a surface is compatible with the micro-electronics industry,thus enabling of the fabrication highly integrated circuits of SWNTs.
文摘A procedure for purification of single walled carbon nanotubes(SWNTs) grown by the chemical vapour deposition(CVD) of carbon monooxide has been developed. Based on the result from TGA/DTA of as prepared sample, the oxidation temperature was determined. The process included sonication, oxidation and acid washing steps. The purity and yield after purification were determined and estimated by TEM. Moreover, for the first time, a loop structure for CVD SWNTs has been observed.
文摘Field effect transistors (FET) based on Single-Walled Carbon Nanotubes (SWNTs) become the hot topic in fields of nano-electronic, clinical diagnostics, environmental testing etc. in recent years. In this paper, we reported a simple, scalable way to enrich semiconducting SWNTs by using HNO3/H2SO4. Then carbon nanotube field-effect transistors (CNTFET) biosensor was fabricated with the enrichment SWNTs for Escherichia coli O157︰H7 detection. The response of each CNTFET was monitored in real time before and after introduction of the Escherichia coli O157︰H7 at various concentrations. The results show that CNT-FET biosensors we fabricated are sensitive to change of concentration of solution and response time is really short.
基金Funded by the National Natural Science Foundation of China(No.31300791)
文摘Carbon nanotubes （CNTs） were extensively explored for their beneficial use in nervous system tissue engineering. However, an important concern regarding the use of CNTs is their toxicity during the interaction between cells and the nano particles. The rat pheochromocytoma cell line （PC12） was co-cultured with three types of single-walled carbon nanotubes （SWNTs）, purified raw SWNTs （C）, hydroxyl purified SWNTs （C-OH） and carboxyl purified SWNTs （C-COOH） at 25 μg/mL and 100 μg/ml. The experimental results revealed that SWNTs at the concentration below 100 μg/mL did not affect the cell viability. Notably, powerful antioxidant system in nerous system tissue is able to counteract with the toxicity of CNTs, which is characterized by the prominently enhanced expression of main antioxidant enzymes （catalase （CAT）, superoxide dismutase （SOD）, glutathione peroxidase （GPx） and glutathione-S-transferase （GST））. Therefore, we believe that CNTs can be good candidates for the fabrication of biomedical scaffolds for the nerve tissue repair.
