VLSI-Compatible Carbon Nanotube Doping Technique with Low Work-Function Metal Oxides

Nano Letters ◽  
2014 ◽  
Vol 14 (4) ◽  
pp. 1884-1890 ◽  
Author(s):  
Luckshitha Suriyasena Liyanage ◽  
Xiaoqing Xu ◽  
Greg Pitner ◽  
Zhenan Bao ◽  
H.-S. Philip Wong
Keyword(s):  
Carbon Nanotube ◽  
Metal Oxides ◽  
Work Function ◽  
Doping Technique

scholarly journals Facile synthesis of carbon nanotube-supported NiO//Fe2O3 for all-solid-state supercapacitors

2019 ◽  
Vol 10 ◽  
pp. 1923-1932 ◽  
Author(s):  
Shengming Zhang ◽  
Xuhui Wang ◽  
Yan Li ◽  
Xuemei Mu ◽  
Yaxiong Zhang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Solid State ◽  
Metal Oxides ◽  
Reduction Method ◽  
High Capacity ◽  
Rate Capability ◽  
High Energy ◽  
High Energy Density ◽  
Carbon Cloth

We have successfully prepared iron oxide and nickel oxide on carbon nanotubes on carbon cloth for the use in supercapacitors via a simple aqueous reduction method. The obtained carbon cloth–carbon nanotube@metal oxide (CC-CNT@MO) three-dimensional structures combine the high specific capacitance and rich redox sites of metal oxides with the large specific area and high electrical conductivity of carbon nanotubes. The prepared CC-CNT@Fe2O3 anode reaches a high capacity of 226 mAh·g−1 at 2 A·g−1 with a capacitance retention of 40% at 40 A·g−1. The obtained CC-CNT@NiO cathode exhibits a high capacity of 527 mAh·g−1 at 2 A·g−1 and an excellent rate capability with a capacitance retention of 78% even at 40 A·g−1. The all-solid-state asymmetric supercapacitor fabricated with these two electrodes delivers a high energy density of 63.3 Wh·kg−1 at 1.6 kW·kg−1 and retains 83% of its initial capacitance after 5000 cycles. These results demonstrate that our simple aqueous reduction method to combine CNT and metal oxides reveals an exciting future in constructing high-performance supercapacitors.

scholarly journals Barium-functionalized multiwalled carbon nanotube yarns as low-work-function thermionic cathodes

2008 ◽  
Vol 92 (15) ◽  
pp. 153108 ◽  
Author(s):  
Lin Xiao ◽  
Peng Liu ◽  
Liang Liu ◽  
Kaili Jiang ◽  
Xiaofeng Feng ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Work Function ◽  
Multiwalled Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Thermionic Cathodes ◽  
Carbon Nanotube Yarns

In situ synthesis of metal oxides in carbon nanotube arrays and mechanical properties of the resulting structures

Carbon ◽  
2012 ◽  
Vol 50 (12) ◽  
pp. 4432-4440 ◽  
Author(s):  
Jordan R. Raney ◽  
Hong-Li Zhang ◽  
Daniel E. Morse ◽  
Chiara Daraio
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Metal Oxides ◽  
In Situ Synthesis ◽  
Nanotube Arrays ◽  
Carbon Nanotube Arrays

Enhanced Electron Field Emission from Carbon Nanotube Matrices

2011 ◽  
Vol 1283 ◽  
Author(s):  
Archana Pandey ◽  
Abhishek Prasad ◽  
Yoke Khin Yap ◽  
Mark Engelhard ◽  
Chongmin Wang
Keyword(s):  
Carbon Nanotube ◽  
Electric Field ◽  
Work Function ◽  
Field Emission ◽  
Threshold Field ◽  
Screening Effect ◽  
Emission Properties ◽  
Site Density ◽  
Low Emission ◽  
Emission Threshold

ABSTRACTField emission from as-grown carbon nanotube (CNTs) films often suffered from high threshold electric field, and low emission site density due to screening effects. These problems can be resolved by patterned growth of CNTs on lithographically prepared catalyst films. However, these approaches are expensive and not applicable for future emitting devices with large display areas. Here we show that as-grown CNTs films can have low emission threshold field and high emission density without using any lithography processes. We have reduced screening effects and work function of as-grown CNTs films and created the novel CNT matrices by addition of vapor- and/or liquid- phase deposition. Furthermore, these CNT matrices can continuous emit electrons for 40 hours without significant degradation. The fabrication of our CNT matrices is described as follows. First, CNT films were grown by plasma-enhanced chemical vapor deposition. These vertically-aligned multiwalled carbon nanotubes (VA-MWCNTs) are having typical length and diameter of 4 microns and 40 nm, respectively. Spacing between these CNTs is ~80 nm in average, leading to poor emission properties due to the screening effect. These as-grown samples were then subjected to the deposition of strontium titanate (SrTiO3) by pulsed-laser deposition to reduce both the work function and screening effect of CNTs. The emission properties of these coated samples can be further improved by fully filled the spaces between VA-MWCNTs by poly-methyl metha acrylate (PMMA). The field emission threshold electric field was decreased from 4.22 V/μm for as-grown VA-MWCNTs to 1.7 V/μm for SrTiO3 coated VA-MWCNTs. The addition filling with PMMA and mechanical polishing can further reduce the threshold to 0.78V/μm for the so called PMMA-STO-CNT matrices. Long term emission stability and emission site density were also enhanced.

scholarly journals Universal Work Function of Metal Oxides Exposed to Air

2019 ◽  
Vol 6 (12) ◽  
pp. 1802058 ◽  
Author(s):  
Kevin J. Rietwyk ◽  
David A. Keller ◽  
Adam Ginsburg ◽  
Hannah‐Noa Barad ◽  
Maayan Priel ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Work Function

Low pressure hydrogen sensing based on carbon nanotube field emission: Mechanism of atomic adsorption induced work function effects

Carbon ◽  
2017 ◽  
Vol 124 ◽  
pp. 669-674 ◽  
Author(s):  
Yangyang Zhao ◽  
Jianqiu Cai ◽  
Haijun Luo ◽  
Song Kang ◽  
Weijin Qian ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Work Function ◽  
Field Emission ◽  
Low Pressure ◽  
Emission Mechanism ◽  
Hydrogen Sensing ◽  
Atomic Adsorption ◽  
Pressure Hydrogen
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