Self-Assembled Porphyrin Nanofiber Membrane-Decorated Alumina Channels for Enhanced Photoelectric Response

Abstract

Photoresponsive nanochannel systems whose ionic transportation properties can be controlled by the photoelectric effect, such as for green chlorophyll pigments in plants, are attracting widespread attention. Herein, we prepared photoresponsive heterogeneous nanochannels by decorating self-assembled tetra­(4-sulfonatophenyl)­porphyrin (TPPS) nanofiber membranes on a membrane of hourglass-shaped alumina (Al2O3) nanochannels using the diffusion-limited patterning (DLP) method. The close arrangement of large-area nanofibers promoted the photoresponse sensitivity of the heterogeneous nanochannels, which showed the highest ionic transportation current. With illumination comparable to sunlight in intensity, the photoresponsive ionic current was approximately 9.7 μA, demonstrating photoswitching, which could be used to regulate the reversible transformation of ionic currents. Meanwhile, the cooperative effect of the TPPS nanofibers assembled at the entrance to the nanochannels and the TPPS molecules inside the nanochannels allowed the heterogeneous nanochannels to exhibit a good rectifying performance.

The Confinement Effect of Angstrom‐Sized Pores in Asymmetrical Membrane Constructed by Zeolitic Imidazolate Frameworks: Partially Dehydrated Ion Transport Performance

“…Though adjusting the pH of electrolyte, ZIF‐90/AAO membrane with asymmetrical geometry, chemical composition and charge distribution can be attained. The asymmetrical structure plays important roles in the ion rectification behavior …”

Bio-inspired nanochannels: fabrication, modification and bioanalytical applications

“…由于具有三维互连多孔结 构、优异的力学性能和生物相容性、丰富的表面基团 等优点, 水凝胶是一种构建三维离子通道的理想材 料 [74] . Jiang课题组 [58] 制备了由三维多孔微/纳米水凝 [77] . 采用蒸发诱导自组装方 法, 构建具有不对称几何结构、化学成分和表面电荷 极性的介孔碳/氧化铝异质膜, 其离子电流整流比高达 450.…”

Ionic Diffusion, Nanoparticle Formation and Trapping Within Sol‐Gel Made Pillared Planar Nanochannels in a Simple Microfluidic Device

“…However, some examples of nanofluidic experiments were performed in extremely simple bottom-up synthesized structures. These include nanochannels obtained by exploiting the cracking patterns of polymers upon tensile stresses, [19][20][21][22] unorganized nanoporous matrices, [23][24][25] inorganic, [26][27][28][29] carbon nanotube [30] membranes and hollow nanowire arrays. [31,32] Although these methods are very affordable they still have some major drawbacks.…”