scholarly journals Digitally Patterned Mesoporous Carbon Nanostructures of Colorless Polyimide for Transparent and Flexible Micro-Supercapacitor

Energies ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2547
Author(s):  
Hyeonwoo Kim ◽  
Suwon Hwang ◽  
Taeseung Hwang ◽  
Jung Bin In ◽  
Junyeob Yeo
Keyword(s):  
Carbon Nanostructures ◽  
Specific Area ◽  
Bending Test ◽  
Chemical Compositions ◽  
Carbon Structure ◽  
Carbon Structures ◽  
Direct Laser ◽  
Mechanical Bending ◽  
Minimal Reduction ◽  
High Flexibility

Here, we demonstrate the fabrication of a flexible and transparent micro-supercapacitor (MSC), using colorless polyimide (CPI) via a direct laser writing carbonization (DLWC) process. The focused laser beam directly carbonizes the CPI substrate and generates a porous carbon structure on the surface of the CPI substrate. Fluorine, which is one of the chemical compositions of CPI, can enhance the specific area and the conductivity of the carbon electrode by creating micropores in carbon structures during carbonization. Thus, the fabricated carbonized CPI-based MSC shows enhanced specific capacitance (1.20 mF at 10 mV s−1) and better transmittance (44.9%) compared to the conventional PI-based MSC. Additionally, the fabricated carbonized CPI-based MSC shows excellent cyclic performance with minimal reduction (<~10%) in 3000 cycles and high capacitance retention under mechanical bending test conditions. Due to its high flexibility, transparency, and capacitance, we expect that carbonized CPI-based MSC can be further applied to various flexible and transparent applications.

scholarly journals Moisture-Assisted Formation of High-Quality Silver Nanowire Transparent Conductive Films with Low Junction Resistance

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 671
Author(s):  
Lipeng Zhou ◽  
Yuehui Hu ◽  
Hao Gao ◽  
Youliang Gao ◽  
Wenjun Zhu ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Capillary Condensation ◽  
Silver Nanowire ◽  
Environmental Stability ◽  
Bending Test ◽  
Commercial Application ◽  
Junction Resistance ◽  
Transparent Conductive Film ◽  
Conductive Film ◽  
Mechanical Bending

Silver nanowire (AgNWs) transparent conductive film (TCF) is considered to be the most favorable material to replace indium tin oxide (ITO) as the next-generation transparent conductive film. However, the disadvantages of AgNWs, such as easy oxidation and high wire-wire junction resistance, dramatically limit its commercial application. In this paper, moisture treatment was adopted, and water was dripped on the surface of AgNWs film or breathed on the surface so that the surface was covered with a layer of water vapor. The morphology of silver nanowire mesh nodes is complex, and the curvature is large. According to the capillary condensation theory, water molecules preferentially condense near the geometric surface with significant curvature. The capillary force is generated, making the wire-wire junction of AgNWs mesh bond tightly, resulting in good ohmic contact. The experimental results show that AgNWs-TCF treated by moisture has better conductivity, with an average sheet resistance of 20 Ω/sq and more uniform electrical properties. The bending test and adhesion test showed that AgNWs-TCF treated by moisture still exhibited good mechanical bending resistance and environmental stability.

Evaluation of elastic, elastic-plastic properties of thin Pt wire by mechanical bending test

2010 ◽  
Vol 103 (2) ◽  
pp. 493-496 ◽  
Author(s):  
S. K. Deb Nath ◽  
Hironori Tohmyoh ◽  
M. A. Salam Akanda
Keyword(s):  
Bending Test ◽  
Plastic Properties ◽  
Elastic Plastic ◽  
Mechanical Bending

Improving the fluorescence detection limit with positively charged carbon nanostructures as a low background signal platform

The Analyst ◽  
2014 ◽  
Vol 139 (9) ◽  
pp. 2114-2117 ◽  
Author(s):  
Xiulan He ◽  
Li Zhang ◽  
Hetong Qi ◽  
Ping Yu ◽  
Junjie Fei ◽  
...  
Keyword(s):  
Detection Limit ◽  
Fluorescence Detection ◽  
Carbon Nanostructures ◽  
Fluorescent Dyes ◽  
Energy Transfer Efficiency ◽  
Background Signal ◽  
Low Background ◽  
Carbon Structures ◽  
New Strategy ◽  
Positively Charged

We have demonstrated a new strategy to improve the fluorescence detection limit by enhancing the energy transfer efficiency between carbon structures and fluorescent dyes using polyimidazolium-functionalized carbon nanostructures as a low background signal platform.

Synergistic incorporation of hybrid heterobimetal–nitrogen atoms into carbon structures for superior oxygen electroreduction performance

2016 ◽  
Vol 6 (7) ◽  
pp. 2085-2091 ◽  
Author(s):  
Young-Woo Lee ◽  
Geon-Hyoung An ◽  
Seul Lee ◽  
John Hong ◽  
Byung-Sung Kim ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Oxygen Electroreduction ◽  
Carbon Structure ◽  
Nitrogen Doped ◽  
Carbon Structures ◽  
Nitrogen Doped Carbon

A hybrid heterobimetal–nitrogen-doped carbon structure exhibits good electrochemical properties in ORR.

scholarly journals Computational Analysis for Morphological Evolution in Pyrolysis for Micro/Nanofabrication

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Myeongseok Yang ◽  
Wooju Lee ◽  
Heungjoo Shin ◽  
Dongchoul Kim
Keyword(s):  
Phase Field ◽  
Computational Analysis ◽  
Morphological Evolution ◽  
Interface Energy ◽  
Comprehensive Model ◽  
Fabrication Technique ◽  
Carbon Structure ◽  
Kinetic Rate ◽  
Final Shape ◽  
Carbon Structures

Pyrolysis is recently proposed as an efficient fabrication technique of micro/nanoscale carbon structures. In order to understand the morphological evolution in pyrolysis and design the final shape of carbon structure, this study proposes a comprehensive model that incorporates the essential mechanisms of pyrolysis based on the phase field framework. Computational analysis with the developed model provides information about the effect of interface energy and kinetic rate on the morphological evolution in pyrolysis.

scholarly journals 14C/12C Variations of Samples Exposed in Air According to Carbon Structure and Air Temperature

Radiocarbon ◽  
2013 ◽  
Vol 55 (2) ◽  
pp. 593-598
Author(s):  
J H Park ◽  
W Hong ◽  
G Park ◽  
K S Sung
Keyword(s):  
Mass Spectrometry ◽  
Carbon Nanotube ◽  
Air Temperature ◽  
Accelerator Mass Spectrometry ◽  
Radiocarbon Dating ◽  
Pyrolytic Graphite ◽  
Carbon Structure ◽  
Graphite Sheet ◽  
Ams Radiocarbon Dating ◽  
Carbon Structures

Various carbon structures, including carbon nanofilament (CNF), single-wall carbon nanotube (SWCNT), multi-wall carbon nanotube (MWCNT), and pyrolytic graphite sheet (PGS), were exposed in air to determine how they vary according to carbon structure and air temperature. CNF is the carbon structure used in accelerator mass spectrometry (AMS) radiocarbon dating (Santos et al. 2007). When CNF and MWCNT were exposed in cold air (3 or −18 °C) for longer than 6 hr, their 14C/12C ratio increased (>5 × 10–14). When heated in an oven (200 or 250 °C) for longer than 12 hr, their 14C/12C ratio decreased. However, when SWCNT and PGS were exposed in air cooled to 3 °C for 12 hr, their 14C/12C ratio did not increase. This phenomenon is very curious, and is useful for the development of a storage method for carbon samples made by reduction reactions of CO2.

scholarly journals Carbon Nanostructures Doped with Transition Metals for Pollutant Gas Adsorption Systems

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5346
Author(s):  
J. M. Ramirez-de-Arellano ◽  
M. Canales ◽  
L. F. Magaña
Keyword(s):  
Carbon Nanotubes ◽  
Transition Metals ◽  
Carbon Nanostructures ◽  
Gas Adsorption ◽  
Chemical Warfare Agents ◽  
Specific Area ◽  
Chemical Warfare ◽  
Wide Range ◽  
Warfare Agents ◽  
Adsorption Systems

The adsorption of molecules usually increases capacity and/or strength with the doping of surfaces with transition metals; furthermore, carbon nanostructures, i.e., graphene, carbon nanotubes, fullerenes, graphdiyne, etc., have a large specific area for gas adsorption. This review focuses on the reports (experimental or theoretical) of systems using these structures decorated with transition metals for mainly pollutant molecules’ adsorption. Furthermore, we aim to present the expanding application of nanomaterials on environmental problems, mainly over the last 10 years. We found a wide range of pollutant molecules investigated for adsorption in carbon nanostructures, including greenhouse gases, anticancer drugs, and chemical warfare agents, among many more.

scholarly journals Three-point and four-point mechanical bending test modeling and application in solar cells

2019 ◽  
Vol 68 (20) ◽  
pp. 208801
Author(s):  
Ren He ◽  
Ying-Ye Li ◽  
Jing-Xin Chen ◽  
Xue-Ling Zhao ◽  
Huan Tang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Bending Test ◽  
Mechanical Bending

scholarly journals Micro-Nano Carbon Structures with Platelet, Glassy and Tube-Like Morphologies

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1242 ◽  
Author(s):  
Liu ◽  
Huang ◽  
Xiong ◽  
Wang ◽  
Chen ◽  
...  
Keyword(s):  
Carbon Source ◽  
Carbon Nanostructures ◽  
Phenol Formaldehyde ◽  
Phenol Formaldehyde Resin ◽  
Production Costs ◽  
Formaldehyde Resin ◽  
Low Carbon ◽  
Graphite Nanoplatelets ◽  
Carbon Structures

Carbon source precursors for high-grade, clean, and low-carbon refractories were obtained by in situ exfoliation of flake graphite (FG) and phenol–formaldehyde resin (PF) composites with three-roll milling (TRM) for the fabrication of graphite nanoplatelets. In addition, by using Ni(NO3)2·6H2O as a catalyst in the pyrolysis process, multidimensional carbon nanostructures were obtained with coexisting graphite nanoplatelets (GNPs), glassy carbon (GC), and carbon nanotubes (CNTs). The resulting GNPs (exfoliated 16 times) had sizes of 10–30 μm, thicknesses of 30–50 nm, and could be uniformly dispersed in GC from the PF pyrolysis. Moreover, Ni(NO3)2·6H2O played a key role in the formation and growth of CNTs from a catalytic pyrolysis of partial PF with the V–S/tip growth mechanisms. The resulting multidimensional carbon nanostructures with GNPs/GC/CNTs are attributed to the shear force of the TRM process, pyrolysis, and catalytic action of nitrates. This method reduced the production costs of carbon source precursors for low-carbon refractories, and the precursors exhibited excellent performances when fabricated on large scales.

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