印刷制作的双半导体底层碳纳米管薄膜阴极的稳定电子发射（英文）
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摘要
应用带保护气进行烧结的方法,制作了一种双半导体底层碳纳米管薄膜阴极.利用烧结的银浆形成条形银电极,在条形银电极表面制作了具有相同宽度且平行排列的ZnO掺杂底层和TiO2掺杂底层,在掺杂底层上面制备了碳纳米管膜层.由于保护气的防氧化屏蔽,碳纳米管膜层中的碳纳米管未受损害,ZnO粒子和TiO2粒子也在烧结过程中得到了很好地保护,双半导体底层碳纳米管薄膜阴极获得更优的电子发射特性,且电子发射稳定性也得到有效增强.与普通条形银电极碳纳米管阴极相比,双半导体底层碳纳米管薄膜阴极能够将开启电场从2.09V/μm降低到1.91V/μm,将最大电子发射电流从1 653.5μA提高到2 672.9μA.在2.69V/μm电场作用下,普通条形银电极碳纳米管阴极的电子发射电流仅为421.1μA,而双半导体底层碳纳米管薄膜阴极的电子发射电流能够达到723.5μA.从发射电流稳定性实验曲线可以看出,双半导体底层碳纳米管薄膜阴极实现了稳定的电子发射,表明ZnO掺杂底层和TiO2掺杂底层能够应用于真空环境.利用数码相机获得了具有良好质量的发射图像,验证了双半导体底层碳纳米管薄膜阴极制作的可行性和适用性.
Utilizing the sintering method with shielding gas,a double semiconductor underlayer carbon nanotube(DSU-CNT)film cathode was fabricated,where stripe silver electrode was formed with the sintered silver slurry,while ZnO and TiO_2 blending underlayers of the same width were parallel-arranged over stripe silver electrode surface,with the CNT film layer being prepared over the above underlayers.Due to better protection from oxidation by the shielding gas,no CNTs in CNT film layer were damaged,and ZnO and TiO_2 particles were also shielded in the sintering process.Thus,improved electron emission characteristics of DSU-CNT film cathode were achieved,and the electron emission stability was also efficiently enhanced.As compared to the common stripe silver electrode CNT cathode,the turn-on electric field of DSU-CNT film cathode could be reduced from 2.09 V/μm to 1.91 V/μm,the maximum electron emission current could be increased from 1 653.5μA to 2 672.9μA.With the same electric field of 2.69 V/μm,the emission current of common stripe silver electrode CNT electrode was only 421.1μA,while that of DSU-CNT film cathode could reach 723.5μA.Seen from the experimental curves of emission current stability,the stable electron emission for DSU-CNT film cathode was realized,which proved that ZnO and TiO2 blending underlayers could be used in the vacuum environment.A satisfactory emission image was obtained,which indicated that the fabrication of DSU-CNT film cathode was feasible and the proposed DSU-CNT film cathode was a suitable electron emission cathode.
Utilizing the sintering method with shielding gas,a double semiconductor underlayer carbon nanotube(DSU-CNT)film cathode was fabricated,where stripe silver electrode was formed with the sintered silver slurry,while ZnO and TiO_2 blending underlayers of the same width were parallel-arranged over stripe silver electrode surface,with the CNT film layer being prepared over the above underlayers.Due to better protection from oxidation by the shielding gas,no CNTs in CNT film layer were damaged,and ZnO and TiO_2 particles were also shielded in the sintering process.Thus,improved electron emission characteristics of DSU-CNT film cathode were achieved,and the electron emission stability was also efficiently enhanced.As compared to the common stripe silver electrode CNT cathode,the turn-on electric field of DSU-CNT film cathode could be reduced from 2.09 V/μm to 1.91 V/μm,the maximum electron emission current could be increased from 1 653.5μA to 2 672.9μA.With the same electric field of 2.69 V/μm,the emission current of common stripe silver electrode CNT electrode was only 421.1μA,while that of DSU-CNT film cathode could reach 723.5μA.Seen from the experimental curves of emission current stability,the stable electron emission for DSU-CNT film cathode was realized,which proved that ZnO and TiO2 blending underlayers could be used in the vacuum environment.A satisfactory emission image was obtained,which indicated that the fabrication of DSU-CNT film cathode was feasible and the proposed DSU-CNT film cathode was a suitable electron emission cathode.
引文
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[2]CHATTERJEE M J,MITRA M,BANERJEE D.Thermoelectric performance of polypyrrole and single walled carbon nanotube composite[J].Materials Today:Proceedings,2018,5(3):9743-9748.
[3]VISHALLI,KAUR R,RAINA K K,et al.Study of single walled carbon nanotubes irradiated by swift heavy ions[J].Materials Today:Proceedings,2016,3(6):2062-2068.
[4]MAITY S,DAS N S,SANTRA S,et al.CdS nanoparticle coated carbon nanotube through magnetron sputtering and its improved field emission performance[J].Current Applied Physics,2016,16(10):1293-1302.
[5]ALGARNI H,UMAR A,KIM S H,et al.Highly stable field emission properties from well-crystalline 6-Fold symmetrical hierarchical ZnO nanostructures[J].Ceramics International,2017,43(15):11753-11758.
[6]ORGE C A,SOARES O S G P,FARIA J L,et al.Synthesis of TiO2-carbon nanotubes through ball-milling method for mineralization of oxamic acid(OMA)by photocatalytic ozonation[J].Journal of Environmental Chemical Engineering,2017,5(6):5599-5607.
[7]REZANIA H.The effects of boron doping on the optical absorption of carbon nanotubes[J].Optik-International Journal for Light and Electron Optics,2015,126(19):1918-1922.
[8]ROSADO G,VERDE Y,VALENZUELA-MUNIZ A M,et al.Catalytic activity of Pt-Ni nanoparticles supported on multi-walled carbon nanotubes for the oxygen reduction reaction[J].International Journal of Hydrogen Energy,2016,41(48):23260-23271.
[9]KIM H J,KIM H N,RAZA H S,et al.An intraoral miniature X-ray tube based on carbon nanotubes for dental radiography[J].Nuclear Engineering and Technology,2016,48(3):799-804.
[10]GHASALI E,SANGPOUR P,JAM A,et al.Microwave and spark plasma sintering of carbon nanotube and graphene reinforced aluminum matrix composite[J].Archives of Civil and Mechanical Engineering,2018,18(4):1042-1054.
[11]FARBOD M,ZILAIE A,KAZEMINEZHAD I.Carbon nanotubes length optimization for preparation of improved transparent and conducting thin film substrates[J].Journal of Science:Advanced Materials and Devices,2017,2(1):99-104.
[12]MIERCZYNSKI P,DUBKOV S V,BULYARSKII S V,et al.Growth of carbon nanotube arrays on various CtxMey alloy films by chemical vapour deposition method[J].Journal of Materials Science&Technology,2018,34(3):472-480.
[13]TRUONG T K,LEE Y,SUH D.Multifunctional characterization of carbon nanotube sheets,yarns,and their composites[J].Current Applied Physics,2016,16(9):1250-1258.
[14]THAKARE J G,MULIK R S,MAHAPATRA M M.Effect of carbon nanotubes and aluminum oxide on the properties of a plasma sprayed thermal barrier coating[J].Ceramics International,2018,44(1):438-451.
[15]GHOLAMI Z,ZABIDI N A M,GHOLAMI F,et al.Synthesis and characterization of niobium-promoted cobalt/iron catalysts supported on carbon nanotubes for the hydrogenation of carbon monoxide[J].Journal of Fuel Chemistry and Technology,2016,44(7):815-821.
[16]HALDER D,MIDYA P R,DAS S,et al.Amorphous carbon nanotubes incorporated MgO-graphite composite with enhanced properties for steel making furnaces[J].Ceramics International,2016,42(14):15826-15835.
[17]RATTANAMAI S,DULYASEREE P,WANCHAEM T,et al.Optimized manganese oxide nanosheet/manganese oxide thin film/multiwalled carbon nanotubes as hybrid electrode materials for supercapacitors[J].Materials Today:Proceedings,2017,4(5):6404-6409.
[18]THIRUMAL V,PANDURANGAN A,JAYAVEL R,et al.Synthesis of nitrogen doped coiled double walled carbon nanotubes by chemical vapor deposition method for supercapacitor applications[J].Current Applied Physics,2016,16(8):816-825.
[19]BAEG K J,JEONG H J,JEONG S Y,et al.Enhanced ambipolar charge transport in staggered carbon nanotube fieldeffect transistors for printed complementary-like circuits[J].Current Applied Physics,2017,17(4):541-547.
[20]KANDASAMY R,MUHAIMIN I,MOHAMMAD R.Single walled carbon nanotubes on MHD unsteady flow over a porous wedge with thermal radiation with variable stream conditions[J].Alexandria Engineering Journal,2016,55(1):275-285.
[21]TAEI M,ABEDI F.New modified multiwalled carbon nanotubes paste electrode for electrocatalytic oxidation and determination of warfarin in biological and pharmaceutical samples[J].Chinese Journal of Catalysis,2016,37(3):436-445.
[22]PHADTARE V D,PARALE V G,KULKARNI G K,et al.Screen printed carbon nanotube thick film on alumina substrate[J].Ceramics International,2017,43(5):4612-4617.
[23]SAFA S.Enhanced UV-detection properties of carbon nanotube impregnated ZnO nanourchins[J].Optik-international Journal for Light and Electron Optics,2015,126(19):2194-2198.
[24]JAMBAGI S C,BANDYOPADHYAY P P.Plasma sprayed carbon nanotube reinforced splats and coatings[J].Journal of the European Ceramic Society,2017,37(5):2235-2244.
[25]BULLER S,HEISE-PODLESKA M,PFANDER N,et al.Carbon nanotubes as conducting support for potential Mnoxide electrocatalysts:influences of pre-treatment procedures[J].Journal of Energy Chemistry,2016,25(2):265-271.
[26]PASCALI G,MELISI D,VALENTINI M,et al.Spray deposited carbon nanotubes for organic vapor sensors[J].Microelectronics Journal,2014,45(12):1691-1694.
[27]STORTI E,EMMEL M,DUDCZIG S,et al.Development of multi-walled carbon nanotubes-based coatings on carbonbonded alumina filters for steel melt filtration[J].Journal of the European Ceramic Society,2015,35(5):1569-1580.