Pulse tube cryocoolers working at liquid helium temperatures(LHe-PTCs),particularly those in a separated configuration-where the rotary valve assembly is positioned remotely from the cold head-exhibit high reliability...Pulse tube cryocoolers working at liquid helium temperatures(LHe-PTCs),particularly those in a separated configuration-where the rotary valve assembly is positioned remotely from the cold head-exhibit high reliability,long service life,low vibration,and strong resistance to electromagnetic interference.These characteristics make them indispensable for cryogen-free systems.Separated LHe-PTCs are widely used in advanced applications such as quantum physics[1]and particle physics[2],serving as core components in instruments including dilution refrigerators,scanning tunneling microscopes(STM),and superconducting magnet systems.展开更多
The charge interaction and corresponding doping effect between single-walled carbonnanotubes (SWNTs) and various fullerene derivatives, namely, C60, phenyl-C61-butyricacid methyl ester (PC61BM), methano-indenefulleren...The charge interaction and corresponding doping effect between single-walled carbonnanotubes (SWNTs) and various fullerene derivatives, namely, C60, phenyl-C61-butyricacid methyl ester (PC61BM), methano-indenefullerene (MIF), 10,100,40,400-tetrahydrodi[1,4]methanonaphthaleno[5,6]fullerene (ICBA), 1,4-bis(dimethylphenylsilylmethyl)[60]fullerene (SIMEF-1), and dimethyl(orthoanisyl) silylmethyl(dimethylphenylsilylmethyl)[60]fullerene (SIMEF-2), are investigated. A variety of analytical techniques,including field-effect transistors (FETs) made of horizontally aligned arrays ofSWNTs, is used as a means of investigation. Data from different measurements haveto be used to obtain a concrete evaluation for the fullerene-applied SWNTs. The datacollectively points toward the conclusion that fullerenes with high molecular orbitalenergy levels, namely, MIF, SIMEF-1, SIMEF-2, and PC61BM, induce p-type doping,while fullerenes with low molecular orbital energy levels, namely, ICBA and C60,induce n-type doping on the carbon nanotubes. Nevertheless, the SWNTs retained ptypecharacteristics because n-doping induced by the fullerenes are weak compared tothe p-doping of the water and oxygen on carbon nanotubes. This means that fullerenederivatives have the ability to fine-tune the energy levels of carbon nanotubes, whichcan play a crucial role in carbon nanotube-based electronics, such as solar cells, lightemittingdevices, and FETs.展开更多
基金supported by the National Natural Science Foun-dation of China(52476020)the National Key Research and Devel-opment Program of China(2023YFF0721304)the“Pioneer”and“Leading Goose”Research and Development Program of Zhe-jiang Province,China(2025C01080).
文摘Pulse tube cryocoolers working at liquid helium temperatures(LHe-PTCs),particularly those in a separated configuration-where the rotary valve assembly is positioned remotely from the cold head-exhibit high reliability,long service life,low vibration,and strong resistance to electromagnetic interference.These characteristics make them indispensable for cryogen-free systems.Separated LHe-PTCs are widely used in advanced applications such as quantum physics[1]and particle physics[2],serving as core components in instruments including dilution refrigerators,scanning tunneling microscopes(STM),and superconducting magnet systems.
基金Japan Science and Technology Agency,Grant/Award Number:CIAiSJapan Society for the Promotion of Science,Grant/Award Numbers:JP15H05760,JP16H02285,JP17K04970,JP 18H05329,JP19K15669Yashima Foundation。
文摘The charge interaction and corresponding doping effect between single-walled carbonnanotubes (SWNTs) and various fullerene derivatives, namely, C60, phenyl-C61-butyricacid methyl ester (PC61BM), methano-indenefullerene (MIF), 10,100,40,400-tetrahydrodi[1,4]methanonaphthaleno[5,6]fullerene (ICBA), 1,4-bis(dimethylphenylsilylmethyl)[60]fullerene (SIMEF-1), and dimethyl(orthoanisyl) silylmethyl(dimethylphenylsilylmethyl)[60]fullerene (SIMEF-2), are investigated. A variety of analytical techniques,including field-effect transistors (FETs) made of horizontally aligned arrays ofSWNTs, is used as a means of investigation. Data from different measurements haveto be used to obtain a concrete evaluation for the fullerene-applied SWNTs. The datacollectively points toward the conclusion that fullerenes with high molecular orbitalenergy levels, namely, MIF, SIMEF-1, SIMEF-2, and PC61BM, induce p-type doping,while fullerenes with low molecular orbital energy levels, namely, ICBA and C60,induce n-type doping on the carbon nanotubes. Nevertheless, the SWNTs retained ptypecharacteristics because n-doping induced by the fullerenes are weak compared tothe p-doping of the water and oxygen on carbon nanotubes. This means that fullerenederivatives have the ability to fine-tune the energy levels of carbon nanotubes, whichcan play a crucial role in carbon nanotube-based electronics, such as solar cells, lightemittingdevices, and FETs.
