Enhanced field emission from ZnO nanopencils by using pyramidal Si(100) substrates

Synthesis of Bottle-Shaped ZnO Particles through the Oxidation of a Mixture of Al-Zn-Au

“…Similar growth behavior was observed in the growth of ZnO nanowires, 11) the teeth of the ZnO nano- combs 12) and in the legs of the tetrapod ZnO nanocrystals. 13) This growth behavior takes place due to the change of the concentration of Zn vapor during the growth. This finer rodpyramid rod structure was proved to be a single crystal from the TEM observations.…”

“…This finer rodpyramid rod structure was proved to be a single crystal from the TEM observations. 13) Tam et al suggested that the base rod is formed in the early stage of the growth when the concentration of the Zn vapor is very high. As the growth proceeds, the decrease of the Zn supply favors the growth of the finer rod on the base rod.…”

Ultra-low turn-on field from ultra-long ZnO nanowire arrays emitters

“…One route is to lower the work function of ZnO emitters by annealing in hydrogen ambience [12], hydrogen plasma treatment [13], through doping [14] or coupling with other materials [15,16]. The other route is to increase the aspect ratio (ratio of the length to tip radius) of emitters by fabrication nanopencils or nanoneedles with sharp emission tips [17][18][19][20]. Table 1 lists the key parameters of some 1-D ZnO field emitters in the previous literatures.…”

Field emission property of ZnO nanowires prepared by ultrasonic spray pyrolysis

“…In addition, ZNs has advantages in the environmental issue since it has no toxicity, no limitation in the resource, and it could be synthesized by various processes including non vacuum processes such as solution based reaction techniques and ultrasonic spray pyrolysis, in which only relatively low energy is required for the growth process [20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38]. Up to now, several researches have been focusing on the development of cold cathode field emission devices based on ZNs [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. Recently, we also reported an economically viable synthesis technique of ZNs on a soda-lime glass (SLG) substrate utilizing ultrasonic spray pyrolysis (USP) [22,23,24,25].…”

“…Since one dimensional nano-structure such as nanowire has higher morphological aspect ratio than that of a flat surface thin film of the same material, β is significantly increase and it is possible to enhance the electron emission under an applied electric field even at room temperature by utilizing the structural advantage of nanowire. Accordingly, one dimensional material such as ZnO nanowires (abbreviated as ZNs) is know to be one of the promising materials for application in the cold cathode emitter due to its structural property of high aspect ratio [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19]. In addition, ZNs has advantages in the environmental issue since it has no toxicity, no limitation in the resource, and it could be synthesized by various processes including non vacuum processes such as solution based reaction techniques and ultrasonic spray pyrolysis, in which only relatively low energy is required for the growth process [20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38].…”