Frozen‐State Polymerization as a Tool in Conductivity Enhancement of Polypyrrole

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.

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1+1 > 2: Extraordinary Fluid Conductivity Enhancement

Current Nanoscience ◽

10.2174/157341309789378104 ◽

2009 ◽

Vol 5 (4) ◽

pp. 527-529 ◽

Cited By ~ 10

Author(s):

Xiaohao Wei ◽

Liqiu Wang

Keyword(s):

Conductivity Enhancement ◽

Fluid Conductivity

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Towards Higher Electric Conductivity and Wider Phase Stability Range via Nanostructured Glass-Ceramics Processing

Nanomaterials ◽

10.3390/nano11051321 ◽

2021 ◽

Vol 11 (5) ◽

pp. 1321

Author(s):

Tomasz K. Pietrzak ◽

Marek Wasiucionek ◽

Jerzy E. Garbarczyk

Keyword(s):

Glass Ceramic ◽

Electronic Conductivity ◽

Glass Ceramics ◽

Temperature Stability ◽

Ceramic Materials ◽

Glassy Matrix ◽

Oxide Glasses ◽

Thermal Transitions ◽

Stability Range ◽

Conductivity Enhancement

This review article presents recent studies on nanostructured glass-ceramic materials with substantially improved electrical (ionic or electronic) conductivity or with an extended temperature stability range of highly conducting high-temperature crystalline phases. Such materials were synthesized by the thermal nanocrystallization of selected electrically conducting oxide glasses. Various nanostructured systems have been described, including glass-ceramics based on ion conductive glasses (silver iodate and bismuth oxide ones) and electronic conductive glasses (vanadate-phosphate and olivine-like ones). Most systems under consideration have been studied with the practical aim of using them as electrode or solid electrolyte materials for rechargeable Li-ion, Na-ion, all-solid batteries, or solid oxide fuel cells. It has been shown that the conductivity enhancement of glass-ceramics is closely correlated with their dual microstructure, consisting of nanocrystallites (5–100 nm) confined in the glassy matrix. The disordered interfacial regions in those materials form “easy conduction” paths. It has also been shown that the glassy matrices may be a suitable environment for phases, which in bulk form are stable at high temperatures, and may exist when confined in nanograins embedded in the glassy matrix even at room temperature. Many complementary experimental techniques probing the electrical conductivity, long- and short-range structure, microstructure at the nanometer scale, or thermal transitions have been used to characterize the glass-ceramic systems under consideration. Their results have helped to explain the correlations between the microstructure and the properties of these systems.

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

Materials ◽

10.3390/ma14081975 ◽

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.

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Anomalous thermal conductivity enhancement in low dimensional resonant nanostructures due to imperfections

Nanoscale ◽

10.1039/d1nr01679b ◽

2021 ◽

Author(s):

Hongying Wang ◽

Yajuan Cheng ◽

Zheyong Fan ◽

Yangyu Guo ◽

Zhongwei Zhang ◽

...

Keyword(s):

Thermal Conductivity ◽

Energy Conversion ◽

Thermal Conductivity Enhancement ◽

Heat Management ◽

Thermoelectric Energy Conversion ◽

Conductivity Enhancement ◽

Thermoelectric Energy ◽

Low Dimensional

Nanophononic metamaterials have broad applications in fields such as heat management, thermoelectric energy conversion, and nanoelectronics. Phonon resonance in pillared low-dimensional structures has been suggested to be a feasible approach...

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