Nanostructured 2D Diporphyrin Honeycomb Film: Photoelectrochemistry, Photodegradation, and Antibacterial Activity

Abstract

Surface patterns of well-defined nanostructures play important roles in fabrication of optoelectronic devices and applications in catalysis and biology. In this paper, the diporphyrin honeycomb film, composed of titanium dioxide, protoporphyrin IX, and hemin (TiO2/PPIX/Hem), was synthesized using a dewetting technique with the well-defined polystyrene (PS) monolayer as a template. The TiO2/PPIX/Hem honeycomb film exhibited a higher photoelectrochemical response than that of TiO2 or TiO2/PPIX, which implied a high photoelectric conversion efficiency and a synergistic effect between the two kinds of porphyrins. The TiO2/PPIX/Hem honeycomb film was also a good photosensitizer due to its ability to generate singlet oxygen ((1)O2) under irradiation by visible light. This led to the use of diporphyrin TiO2/PPIX/Hem honeycomb film for the photocatalytic inactivation of bacteria. In addition, the photocatalytic activities of other metal-diporphyrin-based honeycomb films, such as TiO2/MnPPIX/Hem, TiO2/CoPPIX/Hem, TiO2/NiPPIX/Hem, TiO2/CuPPIX/Hem, and TiO2/ZnPPIX/Hem, were investigated. The result demonstrated that the photoelectric properties of diporphyrin-based film could be effectively enhanced by further coupling of porphyrin with metal ions. Such enhanced performance of diporphyrin compounds opened a new way for potential applications in various photoelectrochemical devices and medical fields.

Breath Figure Method for Construction of Honeycomb Films

“…The honeycomb films formed by organic-inorganic hybrids possess the properties of both organic and inorganic parts, showing potential applications in many fields: electrochemistry [ 117 ], antibacterial treatment [ 118 ], photoelectric devices [ 119 , 120 ], separation [ 121 ], sensors [ 122 ], functional membranes (fluorescent, super-hydrophobic, SERS) [ 98 , 99 , 100 , 114 , 123 ], catalysis [ 99 , 100 ] and so on, as summarized in Figure 17 . The honeycomb films formed by surfactant-modified Au or Ag nanoparticles could be used as the substrate of surface-enhanced Raman spectroscopy (SERS) [ 73 , 99 , 123 ].…”

Studies on DNA interaction of organotin(IV) complexes of meso-tetra(4-sulfonatophenyl)porphine that show cellular activity

“…It has already been observed that anionic porphyrin and TPPS 4itself can bind to DNA externally [46] and, under conditions of high dye concentration, form J-aggregates [47]. Table 1 collects the results of data analyses according to equation (2) relevant to the very first part of the graphs (final part of titration, high C P ).…”

“…Porphyrins and porphyrin-based pigments are molecules known since very long time but that are still object of very high interest in cutting-edge research [1][2][3][4][5]. Sulphonatophenyl porphyrins are used as catalysts [6] and photo-catalysts [7], as sensors for analytical purposes [8,9] and in photodynamic therapy [10][11][12].…”

Photoluminescent Honeycomb Structures from Polyoxometalates and an Imidazolium‐Based Ionic Liquid Bearing a π‐Conjugated Moiety and a Branched Aliphatic Chain

“…[6][7][8][9] Recentp rogress has been focused on furthere xpanding the field from fundamental researcht oe ncouraging industrialized applications by the productiono fl arge-area honeycomb structures. [23][24][25][26][27] The films containing honeycombs tructures with varying sizes and morphologies have been successfully used as molecular sieves, [28] sensors, [29] superhydrophobic coatings, [30] antibacterial surfaces, [31] cell culture reservoirs, [32] and templates for electrodeposition of Au or Ag particlesfor surface-enhanced Ramanscattering (SERS). Up to now,v arious candidates have been explored to form honeycomb structures.B esides polymers with diversec ompositions and structures, [12][13][14][15] av ariety of materials with attractive properties have also been tried, including carbon nanotubes( CNTs), [16,17] grapheneo xide (GO), [18] proteins, [19] small organic molecules, [20][21][22] and inorganic-organic hybrids.…”

“…Up to now,v arious candidates have been explored to form honeycomb structures.B esides polymers with diversec ompositions and structures, [12][13][14][15] av ariety of materials with attractive properties have also been tried, including carbon nanotubes( CNTs), [16,17] grapheneo xide (GO), [18] proteins, [19] small organic molecules, [20][21][22] and inorganic-organic hybrids. [23][24][25][26][27] The films containing honeycombs tructures with varying sizes and morphologies have been successfully used as molecular sieves, [28] sensors, [29] superhydrophobic coatings, [30] antibacterial surfaces, [31] cell culture reservoirs, [32] and templates for electrodeposition of Au or Ag particlesfor surface-enhanced Ramanscattering (SERS). [33,34] Polyoxometalates (POMs) are ab ig class of polyanions which consist of early transition metals in their highest oxidation states.…”