Electrical conductivity enhancement in thermoplastic polyurethane-graphene nanoplatelet composites by stretch-release cycles

2017 ◽  
Vol 110 (12) ◽  
pp. 121904 ◽  
Author(s):  
Pietro Cataldi ◽  
Luca Ceseracciu ◽  
Sergio Marras ◽  
Athanassia Athanassiou ◽  
Ilker S. Bayer
Keyword(s):  
Electrical Conductivity ◽  
Thermoplastic Polyurethane ◽  
Graphene Nanoplatelet ◽  
Conductivity Enhancement

A Highly Crystalline Anthracene-Based MOF-74 Series Featuring Electrical Conductivity and Luminescence

2019 ◽  
Author(s):  
Patricia Scheurle ◽  
Andre Mähringer ◽  
Andreas Jakowetz ◽  
Pouya Hosseini ◽  
Alexander Richter ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Metal Ions ◽  
Light Emission ◽  
Block Design ◽  
High Surface ◽  
Visible Spectrum ◽  
Building Blocks ◽  
Divalent Metal Ions ◽  
Conductivity Enhancement ◽  
Surface Areas

Recently, a small group of metal-organic frameworks (MOFs) has been discovered featuring substantial charge transport properties and electrical conductivity, hence promising to broaden the scope of potential MOF applications in fields such as batteries, fuel cells and supercapacitors. In combination with light emission, electroactive MOFs are intriguing candidates for chemical sensing and optoelectronic applications. Here, we incorporated anthracene-based building blocks into the MOF-74 topology with five different divalent metal ions, that is, Zn2+, Mg2+, Ni2+, Co2+ and Mn2+, resulting in a series of highly crystalline MOFs, coined ANMOF-74(M). This series of MOFs features substantial photoluminescence, with ANMOF-74(Zn) emitting across the whole visible spectrum. The materials moreover combine this photoluminescence with high surface areas and electrical conductivity. Compared to the original MOF-74 materials constructed from 2,5-dihydroxy terephthalic acid and the same metal ions Zn2+, Mg2+, Ni2+, Co2+ and Mn2+, we observed a conductivity enhancement of up to six orders of magnitude. Our results point towards the importance of building block design and the careful choice of the embedded MOF topology for obtaining materials with desired properties such as photoluminescence and electrical conductivity.

scholarly journals Sigmoidal Dependence of Electrical Conductivity of Thin PEDOT:PSS Films on Concentration of Linear Glycols as a Processing Additive

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1975
Author(s):  
Hyeok Jo Jeong ◽  
Hong Jang ◽  
Taemin Kim ◽  
Taeshik Earmme ◽  
Felix Sunjoo Kim
Keyword(s):  
Electrical Conductivity ◽  
Ethylene Glycol ◽  
Triethylene Glycol ◽  
Optical Transmittance ◽  
Monomethyl Ether ◽  
Additive Concentration ◽  
Transparent Electrodes ◽  
Ethylene Glycol Monomethyl Ether ◽  
Conductivity Enhancement ◽  
Poly Styrene Sulfonate

We investigate the sigmoidal concentration dependence of electrical conductivity of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) processed with linear glycol-based additives such as ethylene glycol (EG), diethylene glycol (DEG), triethylene glycol (TEG), hexaethylene glycol (HEG), and ethylene glycol monomethyl ether (EGME). We observe that a sharp transition of conductivity occurs at the additive concentration of ~0.6 wt.%. EG, DEG, and TEG are effective in conductivity enhancement, showing the saturation conductivities of 271.8, 325.4, and 326.2 S/cm, respectively. Optical transmittance and photoelectron spectroscopic features are rather invariant when the glycols are used as an additive. Two different figures of merit, calculated from both sheet resistance and optical transmittance to describe the performance of the transparent electrodes, indicate that both DEG and TEG are two most effective additives among the series in fabrication of transparent electrodes based on PEDOT:PSS films with a thickness of ~50–60 nm.

Incorporating a microcellular structure into PVDF/graphene–nanoplatelet composites to tune their electrical conductivity and electromagnetic interference shielding properties

2018 ◽  
Vol 6 (38) ◽  
pp. 10292-10300 ◽  
Author(s):  
Biao Zhao ◽  
Chongxiang Zhao ◽  
Mahdi Hamidinejad ◽  
Chongda Wang ◽  
Ruosong Li ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Electromagnetic Interference ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Graphene Nanoplatelet ◽  
Shielding Properties

The electrical conductivity and the EMI shielding properties could be effectively tuned by the foaming degree.

The effect of nitric acid (HNO3) treatment on the electrical conductivity and stability of poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) thin films

2017 ◽  
Vol 37 (2) ◽  
pp. 163-168 ◽  
Author(s):  
Suhana Mohd Said ◽  
Shahriar Mufid Rahman ◽  
Bui Duc Long ◽  
Subramanian Balamurugan ◽  
Norhayati Soin ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Nitric Acid ◽  
Acid Treatment ◽  
Base Material ◽  
Operating Conditions ◽  
Organic Polymer ◽  
Visible Range ◽  
Infrared Analysis ◽  
Conductivity Enhancement ◽  
Improved Stability

Abstract In this work, the posttreatment of an organic polymer is performed using an inorganic acid, nitric acid (HNO3). We picked poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as the base material and improved its electrical conductivity by acid treatment with different concentrations of HNO3. The acid treatment was able to achieve the optimum electrical conductivity of 197 S/cm, which is 115.5 times higher than the base material when treated with an aqueous solution containing 65% of HNO3. Moreover, the films showed higher transparency in the visible range while conducting Fourier transform infrared analysis. In addition, the treated films showed improved stability against outdoor operating conditions in terms of sheet resistance compared with untreated PEDOT:PSS films. We tried to develop a hypothesis to describe the reason behind the electrical conductivity enhancement by studying the thicknesses of all the samples at different acid concentration levels. The results from atomic force microscopy, the Hall effect, and the trend of film thickness suggest that the conformational change, the removal of excess PSS from the polymer, and the increase in carrier concentration are the reasons behind the improvement in electrical conductivity.

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