Double anisotropic electrically conductive flexible Janus-typed membranes

Abstract

Novel type III anisotropic conductive films (ACFs), namely flexible Janus-typed membranes, were proposed, designed and fabricated for the first time. Flexible Janus-typed membranes composed of ordered Janus nanobelts were constructed by electrospinning, which simultaneously possess fluorescence and double electrically conductive anisotropy. For the fabrication of the Janus-typed membrane, Janus nanobelts comprising a conductive side and an insulative-fluorescent side were primarily fabricated, and then the Janus nanobelts are arranged into parallel arrays using an aluminum rotary drum as the collector to obtain a single anisotropically conductive film. Subsequently, a secondary electrospinning process was applied to the as-prepared single anisotropically conductive films to acquire the final Janus-typed membrane. For this Janus-typed membrane, namely its left-to-right structure, anisotropic electrical conduction synchronously exists on both sides, and furthermore, the two electrically conductive directions are perpendicular. By modulating the amount of Eu(BA)phen complex and conducting polyaniline (PANI), the characteristics and intensity of the fluorescence-electricity dual-function in the membrane can be tuned. The high integration of this peculiar Janus-typed membrane with simultaneous double electrically conductive anisotropy-fluorescent dual-functionality is successfully realized in this study. This design philosophy and preparative technique will provide support for the design and construction of new types of special nanostructures with multi-functionality.

2D double aeolotropic conductive Janus pellicle with multi-functionality then derived 3D dual-wall Janus-type tube

“…Dope B was slowly poured into dope A and then stirred in an ice-water bath for 3.5 h. Finally, the reaction system was kept at 0°C for 36 h to obtain dope II, and Table 2 summed up the actual components of spinning dope II (S b ). According to the references [48][49][50], when Eu(BA) 3 phen was mixed with PMMA and used as the spinning dope to prepare the insulating-red luminescent part of the Janus nanoribbon, the optimum doping percent of Eu(BA) 3 phen in PMMA was 15%, and as for the Tb(BA) 3 phen/PMMA nanofibers which used as the down layer of the BJP, the optimal doping ratio of Tb(BA) 3 phen in PMMA was also 15%. In a typical procedure, 0.075 g Eu(BA) 3 phen and 0.5 g PMMA were dissolved in a mixed solvent of 0.8 g DMF and 7.2 g CHCl 3 under magnetic stirring for 12 h, and this mixture was used as spinning dopes III (S c ).…”

“…As shown in Figure 5a, the spectral shape of L-LRJF remain unchanged with the augment of PANI content, but the excitation and emission spectra intensity gradually reduce, and the emission intensity is the strongest when the mass ratio of PANI to PMMA is 15% in this study. Since the PANI absorbs ultraviolet light and visible light [50], the addition of PANI weakens the excitation light and the light emitted by the L-LRJF. Therefore, when the intensity of the excitation light keeps the same, the higher the content of PANI in the Janus nanoribbons, the greater the more reduced the intensity of the emitted light.…”

“…Further, the conductive directions of the LRJF on the left side and right side are vertical and the entire specimen is insulated along with the length of the specimen, and thus the LRJF offers double conductive aeolotropism. The test method is based on reference [50]. During the process of testing conductivity, the conductance along the conductive direction of L-LRJF is expressed as L c , and the conductance along with the insulative direction is denoted as L i .…”

Assembling 1D and Janus Nanobelts into 2D Aeolotropic Conductive Janus Membranes and 3D Double‐Walled Janus Tubes

“…Aeolotropic electrically conductive materials have become a research hotspot due to their unique conductive properties. Aeolotropic conductive films (ACFs) with exceptive structure have important applications in some electronic components, photoelectric switch, sensors, screen protector and other fields. Chen, et al .…”

“…Aeolotropic electrically conductive materials have become a research hotspot due to their unique conductive properties. Aeolotropic conductive films (ACFs) [1][2][3][4][5][6] with exceptive structure have important applications in some electronic components, [7] photoelectric switch, [8] sensors, [9] screen protector [10] and other fields. Chen, [11] et al filled the nickel nanopowder into polystyrene film to achieve conductivity along the thickness of the film and insulation along the surface, and the film is known as the type I ACFs.…”