Electrical characterizations of a controllable field emission triode based on low temperature synthesized ZnO nanowires

ABSTRACTA catalyst free, structure-induced heterogeneous nucleation and direct growth of ZnO nanowires on organic and inorganic substrates was prepared by low-temperature solution approach process. The experimental results showed that ZnO nanowires could be directly synthesized upon the concave of substrate without any pre-seeding. In this work ZnO nanowires were grown on both polystyrene bead layer and physical-grinded wafer substrate. ZnO nanowires with a broad aspect ratio of 10−2 ∼ 102 was controlled mainly by adjusting of reactant concentration and pH state of solution. A needle-like ZnO nanotip were also prepared by a two-step limited growth condition as a result that tip diameter is several nanometers only, which may be highly in favor of the field emission. Structure-induced heterogeneous nucleation and growth facilitates the fabrication of ZnO nanowires as the potential photoeletronic units in field-emission displays.

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Low temperature growth of aligned ZnO nanowires and their application as field emission cathodes

Materials Chemistry and Physics ◽

10.1016/j.matchemphys.2009.12.022 ◽

2010 ◽

Vol 120 (2-3) ◽

pp. 691-696 ◽

Cited By ~ 23

Author(s):

Farid Jamali Sheini ◽

Dilip S. Joag ◽

Mahendra A. More ◽

Jai Singh ◽

O.N. Srivasatva

Keyword(s):

Low Temperature ◽

Field Emission ◽

Zno Nanowires ◽

Temperature Growth ◽

Low Temperature Growth ◽

Field Emission Cathodes

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Growth of n-Ga doped ZnO nanowires interconnected with disks over p-Si substrate and their heterojunction diode application

Materials Express ◽

10.1166/mex.2020.1594 ◽

2020 ◽

Vol 10 (1) ◽

pp. 21-28

Author(s):

Yas Al-Hadeethi ◽

Rashad I. Badran ◽

Ahmad Umar ◽

Saleh. H. Al-Heniti ◽

Bahaaudin M. Raffah ◽

...

Keyword(s):

Electrical Properties ◽

Low Temperature ◽

Morphological Characteristics ◽

Zno Nanowires ◽

Heterojunction Diode ◽

Si Substrate ◽

Voltage Range ◽

Doped Zno ◽

Electrical Characterizations ◽

Excellent Stability

In this paper, the heterojunction diode based on n-Ga doped ZnO nanowires interconnected with disks/p-Si assembly was fabricated and their low-temperature electrical properties were examined. The Ga-doped ZnO nanowires interconnected with disks were grown over p-Si substrate and studied by numerous techniques to understand the structural, compositional and morphological characteristics. Electrical properties, at lowtemperatures ranging from 77 K–295 K, were examined for the fabricated heterojunction diode assembly both in reverse and forward biased conditions which exhibited an excellent stability over all the temperature range. The detailed electrical characterizations revealed that the current decreases gradually from 1.9 μA, to 0.87 μA to 0.84 μA when temperature increases from 77 K, 100 K to 150 K and then increases gradually from 1.86 μA–3.36 μA and to 9.95 μA when temperature increases from 200 K–250 K and to 295 K, respectively. Both the highest rectifying ratio at 100 K and the lowest one at 295 K occur in the voltage range of 2–5 V.

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Field-emission triode of low-temperature synthesized ZnO nanowires

IEEE Transactions on Nanotechnology ◽

10.1109/tnano.2006.874049 ◽

2006 ◽

Vol 5 (3) ◽

pp. 216-219 ◽

Cited By ~ 22

Author(s):

Chia Ying Lee ◽

Seu Yi Li ◽

Pang Lin ◽

Tseung-Yuen Tseng

Keyword(s):

Low Temperature ◽

Field Emission ◽

Zno Nanowires

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Multiple-fracturing and viewing of the same frozen sample at different depths using a low temperature FESEM

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100166567 ◽

1996 ◽

Vol 54 ◽

pp. 820-821

Author(s):

M.V. Parthasarathy ◽

C. Daugherty

Keyword(s):

Temperature Field ◽

Low Temperature ◽

Field Emission ◽

Multiple Fracture ◽

Precise Control ◽

Cold Stage ◽

Different Depths ◽

Transfer Device

The versatility of Low Temperature Field Emission SEM (LTFESEM) for viewing frozen-hydrated biological specimens, and the high resolutions that can be obtained with such instruments have been well documented. Studies done with LTFESEM have been usually limited to the viewing of small organisms, organs, cells, and organelles, or viewing such specimens after fracturing them.We use a Hitachi 4500 FESEM equipped with a recently developed BAL-TEC SCE 020 cryopreparation/transfer device for our LTFESEM studies. The SCE 020 is similar in design to the older SCU 020 except that instead of having a dedicated stage, the SCE 020 has a detachable cold stage that mounts on to the FESEM stage when needed. Since the SCE 020 has a precisely controlled lock manipulator for transferring the specimen table from the cryopreparation chamber to the cold stage in the FESEM, and also has a motor driven microtome for precise control of specimen fracture, we have explored the feasibility of using the LTFESEM for multiple-fracture studies of the same sample.

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Multipod ZnO Nanoforms: Low Temperature Synthesis and Characterization

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2007.124 ◽

2007 ◽

Vol 7 (2) ◽

pp. 689-695 ◽

Cited By ~ 5

Author(s):

Tandra Ghoshal ◽

Soumitra Kar ◽

Subhajit Biswas ◽

Gautam Majumdar ◽

Subhadra Chaudhuri

Keyword(s):

Low Temperature ◽

Field Emission ◽

Cross Section ◽

Thermal Evaporation ◽

Synthesis And Characterization ◽

Low Temperature Synthesis ◽

Temperature Synthesis ◽

Optical Absorbance ◽

Higher Temperature ◽

Emission Studies

ZnO nanotetrapods were synthesized by a simple thermal evaporation of Zn powder at a relatively low temperature ∼600 °C. The tetrapods have four legs with hexagonal cross-section. Interpenetrating growth was observed in some of these nanotetrapods. Multipod ZnO nanoforms were produced at higher temperature. The optical characterizations such as optical absorbance, photoluminescence and Raman spectroscopy reveal excellent crystal qualities of these nanoforms. The field emission studies indicated that these nanoforms could be utilized in field emission based devices.

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