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金刚石薄膜电子场发射研究进展 总被引:2,自引:0,他引:2
综述了近来金刚石和类金刚石薄膜电子场发射性能的研究进展,金刚石薄膜是出色的场发射材料,由于其很低的或者是负的电子亲和势(导带能级粒于真空能级之上)和良好的化学稳定性,在真空微电子和场发射显示领域具有广阔的应用前景。 相似文献
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本文提出共面双栅极金刚石薄膜的场发射阵列阴极 (FEAs) ,它由平行的栅极、共面反射极和长条型的金刚石薄膜场发射体组成。采用PIC粒子模拟软件MAGIC模拟这种结构的电子轨迹、相空间图和发射电流 电压等特性 ,并与只有栅极时的情况进行对比 ,表明反射极对电子注有会聚作用 ,能形成层流性良好的电子注 ,该结构可应用于场发射平面显示器等真空微电子器件中 相似文献
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研制了特定比例的纳米金刚石浆料,采用了丝网印刷工艺在石墨衬底上大面积印制了纳米金刚石场发射薄膜,实验探索了石墨衬底纳米金刚石薄膜的烧结工艺和后处理过程,利用扫描电镜(SEM)观察了纳米金刚石膜的表面形貌,经后处理的薄膜中纳米金刚石露出薄膜表面,纳米金刚石的棱角是天然的发射体.采用本课题组研制的多功能场发射测试台在10-6Pa的真空条件下进行了场发射特性的测试,结果发现石墨上低成本大面积印刷的纳米金刚石薄膜具有均匀稳定的场发射特性,作为电子器件的理想冷阴极发射,可在宇宙飞船、原子反应堆等恶劣条件下工作的平面显示器中得到应用. 相似文献
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本提出共面双栅极金刚石薄膜的场发射阵列阴极(FEAs),它由平行的栅极,共面反射极和长条型的金刚石薄膜场发射体组成,采用PIC粒子模拟软件MAGIC模拟这种结构的电子轨迹,相空间图和发射电流-电压等特性,并与只有栅极时的情况进行对比,表明反射极对电子注有会聚作用,能形成层流性良好的电子注,该结构可应用于场发射平面显示器等真空微电子器件中。 相似文献
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宽带隙半导体材料金刚石的负电子亲合势特性使其在电子场发射应用方面备受瞩目。材料的功函数对其热电子发射或场电子发射都有决定性的影响,本从热电子发射的角度出发,对钨基金刚石薄膜阴极有效功函数进行了测量,章阐述了实验方法,装置及结果,测得金刚石涂层阴极的有效功函数为0.70eV,并对实验结果进行了理论分析。 相似文献
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用电泳法制备了纳米金刚石场发射阴极,研究了不同热处理环境对场发射性能的影响.在气氛炉中热处理的样品其阈值场强为8.0V/μm,场发射电流密度在17.7V/μm场强下可达到1361aA/cm^2;而在真空环境中热处理样品的场发射特性与之相比有明显提高,其阈值场强为3.83V/Hm,场发射电流密度在9.44V/μm场强下可达到2801aA/cm^2。用X射线衍射(XRD)和扫描电子显微镜(SEM)对样品表面的结构、成份及形貌进行分析,表明真空环境下的热处理,更有利于样品的电子发射. 相似文献
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碳纳米管具有管径小、长径比高的结构以及物理化学性能稳定等优良特性,被认为是真空冷阴极场发射电子源和场发射平板显示理想的阴极材料。加之碳纳米管兼具有机械强度高、韧性好等出众的力学性能,使其成为复合材料的理想添加相,将其与其他材料复合,可以制备出具有更加出众性能的复合材料。近年来有关碳纳米管及其复合材料场发射研究已成为一个备受关注的热点。概述了阴极场发射理论以及与碳纳米管场发射相关的几种场发射物理机制,介绍了碳纳米管复合场发射阴极的研究现状及制备方法,最后对碳纳米管复合阴极场发射的发展前景进行了展望。 相似文献
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目的 绿色低碳卷烟材料的应用是助力烟草工业企业向节能减碳型企业转型的重要途径,也是向消费者传达绿色低碳概念的“纽带”。方法 介绍烟草工业企业在降重减碳、降解材料减排、循环减排、印刷工艺减排以及智能化绿色设计减排5个方面的应用。结果 用减重、材料替换和V槽工艺减少生物基碳使用,利用丰富的可降解资源减少木材使用,用环保材料替代不可降解材料,让烟箱和香烟固弃物循环再利用,优化纸张效果替代印刷工序和油墨,通过数字化平台打造让设计高效、碳足迹可视、绿色低碳概念,从设计源头到产品输出渗透到卷烟包装材料中的各个环节。结论 未来,还需聚焦于纸基功能材料和其他行业在“双碳”目标中的新举措,纳米纤维素、木质纤维素、非木材纤维和可食性材料的开发与应用,碳交易、碳信用、碳捕捉材料等应用,以及不断在科技创新和基础研究中融入AI概念,不断解放科研人员去做创意性工作,提升创新效率。 相似文献
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《Materials Science and Engineering: R: Reports》2005,48(2-5):47-189
Field emission (FE) is based on the physical phenomenon of quantum tunneling, in which electrons are injected from the surface of materials into vacuum under the influence of an applied electric field. A variety of field emission cold cathode materials have been developed to date. In this review, we shall focus on several kinds of novel cold cathode materials that have been developed in the past decade. These include materials for microfabricated field-emitter arrays, diamond and related films, carbon nanotubes, other quasi one-dimensional nanomaterials and printable composite materials. In addition, cold cathode materials have a wide range of applications such as in flat panel displays, high-power vacuum electronic devices, microwave-generation devices, vacuum microelectronic devices and vacuum nanoelectronic devices. Applications are in consumer goods, military industries and also space technology. A comprehensive overview of the various applications is presented. Recently, recognizing the strong possibility that vacuum nanoelectronic devices using quasi one-dimensional nanomaterials, such as carbon nanotubes may emit electrons with driving voltages comparable to that of a solid-state device, there is a growing interest in novel applications of such devices. With such exciting opportunities, there is now a flurry of activities to explore applications far beyond those considered for the conventional hot cathodes that operate on thermionic emission. We shall discuss the details of a number of fascinating potential applications. 相似文献
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氮化碳具有优良的热稳定性、高热导率、较大的禁带宽度和负的电子亲和势等优点,是一种极具潜力的场发射阴极材料。本文在介绍氮化碳的结构、性能以及作为场发射材料的研究现状的基础上,着重评述了氮化碳薄膜和粉体的制备方法;从优化结构中的sp^(2)簇的数量及尺寸、调控表面形貌、元素掺杂,以及通过与其他场发射材料复合或表面修饰形成多级发射结构等方面,阐述了优化氮化碳场发射性能的方法。最后总结了氮化碳薄膜和粉体分别作为场发射阴极材料仍然存在的问题,并以此指出将来开展相关研究的重点在于继续优化其场发射性能,以及探索其内部结构、缺陷等对场发射性能的影响。 相似文献
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Yunfei Xu Xiaoguang Zhang Bogang Wu Youguo Xu Ruilong Wen Yangai Liu 《Fullerenes, Nanotubes and Carbon Nanostructures》2019,27(4):289-298
Phase change materials (PCMs) require an excellent matrix support material such as porous carbon materials. Orange peel, a discarded, readily available raw material, could potentially be used to prepare biological porous carbon material (BPCM) with abundant pores of uniform size and strong loading capacity through a vacuum freeing method and a carbonization process under nitrogen atmosphere. Herein, paraffin (PA) was encapsulated into BPCM by vacuum impregnation method to obtain environmentally friendly; recyclable PA/carbonized-abandoned orange peel (CAOP) shape-stable PCMs (PA/CAOP SS-PCMs). CAOP was composed of amorphous carbon and a certain degree of graphitization occurred, the best of which was observed following carbonization at 1000?°C. Further, at this temperature, the pores were abundant and PA loading was sufficient. PA/CAOP SS-PCMs were shown to undergo simple physical loading with no chemical interactions and to have good thermal stability and a maximum loading percentage of 88.46%; the calculated maximum loading percentage was of 88.07%. The temperature and latent heat during the melting of PA/CAOP SS-PCMs were 47.68?°C and 180.25?J/g, respectively, and the solidification process occurred 34.47?°C and 177.55?J/g, respectively. The composite exhibited excellent thermal stability and reliability after 200 thermal cycles. Therefore, it has very broad application prospects and value in the fields of energy saving and emission reduction, including solar energy, air conditioning storage cooling systems, and building cladding. 相似文献