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Adsorption and Photocatalytic Decomposition of Gaseous 2-Propanol Using TiO2-Coated Porous Glass Fiber Cloth
摘要： Combinations of TiO2 photocatalysts and various adsorbents have been extensively investigated for eliminating volatile organic compounds (VOCs) at low concentrations. Herein, TiO2 and porous glass cloth composites were prepared by acid leaching and subsequent TiO2 dip-coating of the electrically applied glass (E-glass) cloth, and its adsorption and photocatalytic ability were investigated. Acid leaching increased the specific surface area of the E-glass cloth from 1 to 430 m2/g while maintaining sufficient mechanical strength for supporting TiO2. Further, the specific surface area remained large (290 m2/g) after TiO2 coating. In the photocatalytic decomposition of gaseous 2-propanol, the TiO2-coated porous glass cloth exhibited higher adsorption and photocatalytic decomposition ability than those exhibited by the TiO2-coated, non-porous glass cloth. The porous composite limited desorption of acetone, which is a decomposition intermediate of 2-propanol, until 2-propanol was completely decomposed to CO2. The CO2 generation rate was affected by the temperature condition (15 or 35 °C) and the water content (2 or 18 mg/L); the latter also influenced 2-propanol adsorption in photocatalytic decomposition. Both the conditions may change the diffusion and adsorption behavior of 2-propanol in the porous composite. As demonstrated by its high adsorption and photocatalytic ability, the composite (TiO2 and porous glass cloth) effectively eliminates VOCs, while decreasing the emission of harmful intermediates.
关键词： air purification,composite,adsorption,microporous material,porous glass,photocatalyst,TiO2
更新于2025-11-19 16:51:07
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Highly Ordered 3D Microstructure Based Electronic Skin Capable of Differentiating Pressure, Temperature, and Proximity
摘要： Electronic skin are devices that mimic the functionalities of human skin, which require high sensitivity, large dynamic range, high spatial uniformity, low-cost and large area processability, and the capacity to differentiate various external inputs. We herein introduce a versatile droplet-based microfluidic-assisted emulsion self-assembly (DMESA) process to generate 3-dimensional microstructure based high-performance capacitive and piezoresistive pressure sensors for electronic skin applications. Our technique can generate uniformly sized micropores that are self-assembled in an orderly close-packed manner over a large area, which results in high spatial uniformity. The size of the micropores can easily be tuned from 100-500 μm, through which sensitivity and dynamic range were controlled to as high as 0.86 kPa-1 and up to 100 kPa. Our device can be printed on curvilinear surfaces and be molded into various shapes. We furthermore demonstrate that by simultaneously utilizing capacitive and piezoresistive pressure sensors, we can distinguish between pressure and temperature, or between pressure and proximity. These demonstrations make our process and sensors highly useful for a wide variety of electronic skin applications.
关键词： multimodal sensation,microporous structure,tactile sensing,decoupled stimuli
更新于2025-09-23 15:23:52
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A microporous Tb-MOF luminescent sensor based on a flexible tricarboxylate for highly sensitive detection of acetone and Fe3+ ions in aqueous and isopropanol
摘要： One novel microporous terbium (III) framework, [Tb(DBB)(H2O)2](1), has been prepared from 4-(3,5-dicarboxylatobenzyloxy) benzoic acid (DBB) with terbium salt under hydrothermal condition. Structural analysis shows complex 1 possesses three-dimensional frameworks based on 2D double sheets linking by DBB ligands into porous channels. The gas adsorption experiments of N2 and CO2 show that complex 1 possesses microporous properties. Fluorescence analyses exhibit the characteristic luminescence of Tb3+ ion both in solid state and in aqueous. In particular, the Tb-MOF can detect acetone for its luminescence entirely quenching in acetone. Furthermore, the ionic detection experiments indicate complex 1 could be a good sensor for highly and sensitively sensing Fe3+ ion in aqueous and isopropanol, and the detection limit could reach at 10?9 M in aqueous.
关键词： The microporous Tb-framework,Luminescent sensor for acetone and Fe(III) ion,Crystal structure
更新于2025-09-23 15:23:52
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Highly Photostable and Fluorescent Microporous Solids Prepared via Solid-state Entrapment of BODIPY Dyes in a Nascent Metal-Organic Framework
摘要： We report a strategy to synthesize highly emissive, photostable, microporous materials by solid-state entrapment of boron dipyrromethene (BODIPY) fluorophores in a metal-organic framework. Solvent-free mechanochemistry or accelerated aging enabled quantitative capture and dispersal of the PM605 dye within the ZIF-8 framework starting from inexpensive, commercial materials. While the design of emissive BODIPY solids is normally challenged by quenching in a densely-packed environment, herein reported PM605@ZIF-8 materials show excellent emissive properties and to the best of our knowledge an unprecedented ~10-fold enhancement of BODIPY photostability. Time-resolved and steady-state fluorescence studies of PM605@ZIF-8 show that interchromophore interactions are minimal at low dye loadings, but at higher ones through-pore energy transfer between chromophores and to aggregate species lead to quenching.
关键词： fluorescence,metal-organic framework,photostability,BODIPY,microporous materials
更新于2025-09-23 15:21:21
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Nano-to-Microporous Networks via Inkjet Printing of ZnO Nanoparticles/Graphene Hybrid for Ultraviolet Photodetectors
摘要： Inkjet-printed photodetectors have gained enormous attention over the last decade. However, device performance is limited without post-processing, such as annealing and UV exposure. In addition, it is difficult to manipulate the surface morphology of the printed film using an inkjet printer due to the limited options of low viscosity ink solutions. Here, we employ a concept involving the control of the inkjet-printed film morphology via modulation of co-solvent vapor pressure and surface tension for the creation of a high-performance ZnO-based photodetector on a flexible substrate. The solvent boiling point across different co-solvent systems is found to affect the film morphology, which results in not only distinct photo-response time but also photo-detectivity. ZnO-based photodetectors were printed using different solvents which display a fast photo-response in low-boiling point solvents due to the low carbon residue and larger photo-detectivity in high-boiling point solvent systems due to the porous structure. The porous structure is obtained using both gas-liquid surface tension differences and solid-liquid surface differences, and the size of porosity is modulated from nano-size to micro-size depending on the ratio between two solvents or two nanomaterials. Moreover, the conductive nature of graphene enhances the transport behavior of the photocarrier, which enables a high-performance photodetector with high photo-responsivity (7.5*102 AW-1) and fast photo-response (0.18 s) to be achieved without the use of high-boiling point solvents.
关键词： Inkjet print,photodetector,ZnO nanoparticle (NP),flexible devices,microporous
更新于2025-09-23 15:19:57
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Ferrocene Linkage Facilitated Charge Separation in Conjugated Microporous Polymers
摘要： Conjugated microporous polymers (CMPs) have full access to the organic synthesis toolbox and feature-rich functionality, structural diversity, and high surface area. We incorporated ferrocene (Fc) into the backbones of CMPs and systematically engineered their optical energy gaps. Compared with the CMPs without Fc units yet adopting similar molecular orbital level, Fc-based CMPs can sufficiently generate reactive oxygen species (ROS) under visible light. The resultant ROS are able to effectively decompose the absorbed pollutants, including organic dyes and chemical warfare agents. Specifically, Fc-based CMPs significantly outperform commercial TiO2 (P25) in the degradation of methylene blue and are capable of converting 2-chloroethyl ethyl sulfide (a mustard gas simulant) into completely nontoxic product.
关键词： conjugated microporous polymer,charge separation,photocatalytic degradation,ferrocene,reactive oxygen species
更新于2025-09-19 17:15:36
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Polymeric fibers and microporous films by photo-crosslinking of triphenylene-derived liquid crystals
摘要： Two series of photoreactive discotic liquid crystals consisting of a triphenylene core and six cinnamate units with one (TPC1n) or two (TPC2n) n-alkoxy groups (CnH2n+1O; n = 10–14), respectively, as peripheral groups are synthesized. Both of them are polymerized into ?bers up to 2 mm long by UV irradiation in liquid paraf?n in the columnar LC temperature ranges. The ?ber structures seem to be preconstructed in liquid paraf?n. In addition, TPC2n are shown to form microporous ?lms up to 15 μm in diameter by simply casting the solutions of some solvents followed by drying for several minutes in air at room temperature. Photoirradiation of the ?lms in the LC temperature range converts them to polymeric ones while preserving the microporous and hexagonally ordered structure. From comparison with TPC1n and the hydrogenated derivative of TPC212, the porous ?lm-forming property is suggested to result from the combination of the double bond of the cinnamoyl group and the two long alkoxy chains on the phenyl ring.
关键词： microporous ?lm,cinnamate,self-assembly,photo-crosslinking,structure-property relations,photopolymerization,triphenylene-derived liquid crystals,?ber,membranes
更新于2025-09-19 17:15:36
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Low-voltage self-assembled indium tin oxide thin-film transistors gated by microporous SiO <sub/>2</sub> treated by H <sub/>3</sub> PO <sub/>4</sub>
摘要： Ultralow-voltage (0.8 V) thin-film transistors (TFTs) using self-assembled indium-tin-oxide (ITO) as the semiconducting layer and microporous SiO2 immersed in 5% H3PO4 for 30 minutes with huge electric-double-layer (EDL) capacitance as the gate dielectric are fabricated at room temperature. The huge EDL specific capacitance is 8.2 mF cm-2 at 20 Hz, and about 0.7 mF cm-2 even at 1 MHz. Both enhancement mode (Vth = 0.15 V) and depletion mode (Vth = -0.26 V) operation are realized by controlling the thickness of the self-assembled ITO semiconducting layer. Electrical characteristics with the equivalent field-effect mobility of 65.4 cm2 V-1 s-1, current on/off ratio of 2 × 106, and subthreshold swing of 80 mV per decade are demonstrated, which are promising for fast-switching and low-power electronics on temperature-sensitive substrates.
关键词： self-assembled,thin-film transistors,H3PO4,microporous SiO2,indium tin oxide,Low-voltage
更新于2025-09-16 10:30:52
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Elaboration of microporous CeO2 thin layers having nanocrystallites network controlled by Pluronic P123: Impact of key experimental parameters
摘要： Microporous ceria thin ?lms having nanocrystallites network were synthesized by evaporation-induced self-assembly process, using P123 amphiphilic copolymer as structure-directing agent. The impact of key experimental parameters, i.e., the sol ageing, the relative humidity (RH), the thermal treatment, on the thin layer elaboration were investigated. The results show that the organization of the nanoparticles is possible for a sol ageing time lower than 16 days and that the size of the mesophase within the thin layer increases with the relative humidity ?xed during the ?lm deposition. Finally, an increase of the thermal treatment temperature from 300 to 1000 °C leads to the formation of ?uorite-like dioxide material coupled with a loss of nanocrystallites organization and porosity due to the increase of the size of the crystallites. This loss of nanocrystallites organization is more drastic in the direction perpendicular to the surface and less pronounced along the surface. Thus, a compromise between the crystallization and the preservation of the porosity needs to be found.
关键词： relative humidity,P123 amphiphilic copolymer,evaporation-induced self-assembly,nanocrystallites network,thin films,thermal treatment,Microporous ceria,sol ageing
更新于2025-09-16 10:30:52
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Effect of Linking Pattern of Dibenzothiophene- <i>S</i> , <i>S</i> -dioxide-Containing Conjugated Microporous Polymers on the Photocatalytic Performance
摘要： Conjugated microporous polymers (CMPs) exhibit great potential for photocatalytic hydrogen generation due to their tunable electronic structure. The rational molecular design is a key point for developing an efficient CMP photocatalyst. Herein, we developed two CMPs photocatalysts via the copolymerization from pyrene and dibenzothiophene-S,S-dioxide building blocks. The effect of the linking pattern of the building block of dibenzothiophene-S,S-dioxide on the photocatalytic hydrogen evolution was explored. The polymer of PyDOBT-1 with 3,7-linking pattern shows a superior photocatalytic performance to PyDOBT-2 with 2,8-linking pattern because the 3,7-linking pattern enhances the conjugation chain length and improves the coplanarity of the polymeric backbone, which facilitate the charges migration along the polymer chain. As a result, the bare PyDOBT-1 shows an impressive visible light activity with a hydrogen evolution rate (HER) of 5697 μmol h?1 g?1. Notably, an outstanding HER of 12986 μmol h?1 g?1 was also obtained by the Pt-modified PyDOBT-1 under the full-arc spectrum (λ > 300 nm), which lies toward the upper end compared to that of the reported organic photocatalysts.
关键词： Conjugated microporous polymers,Dibenzothiophene-S,S-dioxide,Photocatalytic hydrogen generation,Linking pattern,Hydrogen evolution rate
更新于2025-09-10 09:29:36