scholarly journals Solvent Effects on Morphology and Electrical Properties of Poly(3-hexylthiophene) Electrospun Nanofibers

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1501 ◽  
Author(s):  
Jung-Yao Chen ◽  
Chien-You Su ◽  
Chau-Hsien Hsu ◽  
Yi-Hua Zhang ◽  
Qin-Cheng Zhang ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Field Effect Transistors ◽  
Electrospun Nanofibers ◽  
Charge Carrier Mobility ◽  
Organic Field Effect Transistors ◽  
Electrospun Nanofiber ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
The Core ◽  
Core Polymer

Herein, poly(3-hexylthiophene-2,5-diyl) (P3HT) nanofiber-based organic field-effect transistors were successfully prepared by coaxial electrospinning technique with P3HT as the core polymer and poly(methyl methacrylate) (PMMA) as the shell polymer, followed by extraction of PMMA. Three different solvents for the core polymer, including chloroform, chlorobenzene and 1,2,4-trichlorobenzene, were employed to manipulate the morphologies and electrical properties of P3HT electrospun nanofibers. Through the analyses from dynamic light scattering of P3HT solutions, polarized photoluminescence and X-ray diffraction pattern of P3HT electrospun nanofibers, it is revealed that the P3HT electrospun nanofiber prepared from the chloroform system displays a low crystallinity but highly oriented crystalline grains due to the dominant population of isolated-chain species in solution that greatly facilitates P3HT chain stretching during electrospinning. The resulting high charge-carrier mobility of 3.57 × 10−1 cm2·V−1·s−1 and decent mechanical deformation up to a strain of 80% make the P3HT electrospun nanofiber a promising means for fabricating stretchable optoelectronic devices.

scholarly journals Conformal Fabrication of an Electrospun Nanofiber Mat on a 3D Ear Cartilage-Shaped Hydrogel Collector Based on Hydrogel-Assisted Electrospinning

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Jin Yeong Song ◽  
Hyun Il Ryu ◽  
Jeong Myeong Lee ◽  
Seong Hwan Bae ◽  
Jae Woo Lee ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Electrospun Nanofibers ◽  
Cell Delivery ◽  
Complex Geometries ◽  
Two Dimensional ◽  
Uniform Thickness ◽  
Electrospun Nanofiber ◽  
Electrospinning Technique ◽  
Ear Cartilage ◽  
Focused Electric Field

AbstractElectrospinning is a common and versatile process to produce nanofibers and deposit them on a collector as a two-dimensional nanofiber mat or a three-dimensional (3D) macroscopic arrangement. However, 3D electroconductive collectors with complex geometries, including protruded, curved, and recessed regions, generally caused hampering of a conformal deposition and incomplete covering of electrospun nanofibers. In this study, we suggested a conformal fabrication of an electrospun nanofiber mat on a 3D ear cartilage-shaped hydrogel collector based on hydrogel-assisted electrospinning. To relieve the influence of the complex geometries, we flattened the protruded parts of the 3D ear cartilage-shaped hydrogel collector by exploiting the flexibility of the hydrogel. We found that the suggested fabrication technique could significantly decrease an unevenly focused electric field, caused by the complex geometries of the 3D collector, by alleviating the standard deviation by more than 70% through numerical simulation. Furthermore, it was experimentally confirmed that an electrospun nanofiber mat conformally covered the flattened hydrogel collector with a uniform thickness, which was not achieved with the original hydrogel collector. Given that this study established the conformal electrospinning technique on 3D electroconductive collectors, it will contribute to various studies related to electrospinning, including tissue engineering, drug/cell delivery, environmental filter, and clothing.

Thermal Characterizations of HPMC/PVA Impregnated with CNC Electrospun Nanofibers

2020 ◽  
Vol 981 ◽  
pp. 115-120
Author(s):  
Etdal Bakhiet ◽  
Siti Fazira Samsudin ◽  
Farah Hanani Zulkifli ◽  
Aizi Nor Mazila Ramli
Keyword(s):  
Hydroxypropyl Methylcellulose ◽  
Electrospun Nanofibers ◽  
Maximum Temperature ◽  
Poly Vinyl Alcohol ◽  
Electrospun Nanofiber ◽  
Random Orientation ◽  
Electrospinning Technique ◽  
Peak Intensity ◽  
Major Weight Loss ◽  
Potential Applications

Interest in the nanotechnology invention has been increased among the researcher and industries which lead to many investigations and studies to develop a product with better performance. In this research, hydroxypropyl methylcellulose (HPMC) and poly (vinyl) alcohol (PVA) nanofiber with the ratio 1:1 and the concentration of 5 wt% and 7 wt%, respectively, were successfully fabricated by using electrospinning technique. The HPMC/ PVA was then blended with the different concentration of cellulose nanocrystal (CNC) at 2 wt%, 4 wt%, 6 wt% and 8 wt%. The SEM results of HPMC/PVA/CNC nanofibers shown random orientation fibers with average diameters of 62.28 nm - 252.80 nm. The TGA results showed three major weight loss that prove the decomposotion of HPMC/PVA/CNC was occured with three maximum temperature peaks around 69 °C, 290 °C and 392 °C. As for DSC, the peak intensity of the Tg in the electrospun nanofiber are decreasing as the concentration of CNCs increased might be due to the interfering of the CNC with the crystallization of the polymer causing mobility of the amorphous regions to be higher. Therefore, the study on the thermal properties of HPMC/PVA incorporated with CNCs nanofibers could be a reference for various potential applications.

Dianthraceno[a,e]pentalenes: synthesis, crystallographic structures and applications in organic field-effect transistors

2015 ◽  
Vol 51 (3) ◽  
pp. 503-506 ◽  
Author(s):  
Gaole Dai ◽  
Jingjing Chang ◽  
Wenhua Zhang ◽  
Shiqiang Bai ◽  
Kuo-Wei Huang ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Field Effect ◽  
Carrier Mobility ◽  
Field Effect Transistors ◽  
Charge Carrier Mobility ◽  
Dense Packing ◽  
Organic Field Effect Transistors ◽  
High Charge ◽  
Crystallographic Structures ◽  
High Charge Carrier Mobility

Two stable dianthraceno[a,e]pentalenes were synthesized and DAP2 exhibited a high charge carrier mobility of 0.65 cm2 V−1 s−1 due to its dense packing.

Influence of solvent additives on the morphology and electrical properties of diF-TES ADT organic field-effect transistors

2019 ◽  
Vol 68 ◽  
pp. 205-211 ◽  
Author(s):  
Carla Patricia Lacerda Rubinger ◽  
Hamna F. Haneef ◽  
Corey Hewitt ◽  
David Carroll ◽  
John E. Anthony ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Organic Field Effect Transistors ◽  
Influence Of Solvent

Effect of Film Morphology on Charge Transport in C60-based Organic Field Effect Transistors

2010 ◽  
Vol 1270 ◽  
Author(s):  
Mujeeb Ullah ◽  
Andrey K. Kadashchuk ◽  
Philipp Stadler ◽  
Alexander Kharchenko ◽  
Almantas Pivrikas ◽  
...  
Keyword(s):  
Grain Size ◽  
Charge Carrier ◽  
Substrate Temperature ◽  
Charge Transport ◽  
Field Effect ◽  
Carrier Mobility ◽  
Field Effect Transistors ◽  
Charge Carrier Mobility ◽  
Film Morphology ◽  
Organic Field Effect Transistors

AbstractThe critical factor that limits the efficiencies of organic electronic devices is the low charge carrier mobility which is attributed to disorder in organic films. In this work we study the effects of active film morphology on the charge transport in Organic Field Effect Transistors (OFETs). We fabricated the OFETs using different substrate temperature to grow different morphologies of C60 films by Hot Wall Epitaxy. Atomic Force Microscopy images and XRD results showed increasing grain size with increasing substrate temperature. An increase in field effect mobility was observed for different OFETs with increasing grain size in C60 films. The temperature dependence of charge carrier mobility in these devices followed the empirical relation named as Meyer-Neldel Rule and showed different activation energies for films with different degree of disorder. A shift in characteristic Meyer-Neldel energy was observed with changing C60 morphology which can be considered as an energetic disorder parameter.

scholarly journals In-Situ Synchrotron SAXS and WAXS Investigation on the Deformation of Single and Coaxial Electrospun P(VDF-TrFE)-Based Nanofibers

2021 ◽  
Vol 22 (23) ◽  
pp. 12669
Author(s):  
Yi-Jen Huang ◽  
Yi-Fan Chen ◽  
Po-Han Hsiao ◽  
Tu-Ngoc Lam ◽  
Wen-Ching Ko ◽  
...  
Keyword(s):  
Hierarchical Structures ◽  
Electrospun Nanofibers ◽  
Mechanical Anisotropy ◽  
Core Shell ◽  
Length Scale ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Core ◽  
Nanofiber Alignment

Coaxial core/shell electrospun nanofibers consisting of ferroelectric P(VDF-TrFE) and relaxor ferroelectric P(VDF-TrFE-CTFE) are tailor-made with hierarchical structures to modulate their mechanical properties with respect to their constituents. Compared with two single and the other coaxial membranes prepared in the research, the core/shell-TrFE/CTFE membrane shows a more prominent mechanical anisotropy between revolving direction (RD) and cross direction (CD) associated with improved resistance to tensile stress for the crystallite phase stability and good strength-ductility balance. This is due to the better degree of core/shell-TrFE-CTFE nanofiber alignment and the crystalline/amorphous ratio. The coupling between terpolymer P(VDF-TrFE-CTFE) and copolymer P(VDF-TrFE) is responsible for phase stabilization, comparing the core/shell-TrFE/CTFE with the pristine terpolymer. Moreover, an impressive collective deformation mechanism of a two-length scale in the core/shell composite structure is found. We apply in-situ synchrotron X-ray to resolve the two-length scale simultaneously by using the small-angle X-ray scattering to characterize the nanofibers and the wide-angle X-ray diffraction to identify the phase transformations. Our findings may serve as guidelines for the fabrication of the electrospun nanofibers used as membranes-based electroactive polymers.

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