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Advantages of TiO2/carbon nanotube modified photocatalytic membranes in the purification of oil-in-water emulsions
摘要： For the effective puri?cation of emulsi?ed oil contaminated waters advanced treatment methods have to be applied, such as membrane ?ltration, which is able to eliminate macro-, and even nanoscale oil droplets, however, membrane fouling is still a major problem, which prevents economic utilization. Therefore, fouling mitigation is one of the most important aspects in the ?eld of membrane separation developments. In the present study, solely TiO2 and TiO2/carbon nanotubes (CNT) composite modi?ed PVDF membranes were prepared and used to purify oil-in-water emulsions. Achievable ?uxes, reversible and irreversible ?ltration resistances, fouling models, ?ltration ef?ciencies and photocatalytic activities were compared in case of different nanomaterial covered and unmodi?ed PVDF membranes. Applying either solely TiO2 or solely CNT coating resulted in the signi?cant reduction of total ?ltration resistance in both cases, but the combination of the two components (TiO2 with 1 wt% CNT) resulted in by far the highest ?ux and lowest resistance, meanwhile, the enhanced photocatalytic ef?ciency of the composite was also achieved. To the best of our knowledge, this study demonstrates the bene?cial effects of the combination of TiO2 and CNT nanomaterials for the ?rst time in the ?eld of membrane separation of oil-in-water emulsions.
关键词： membrane,titanium dioxide,oil-in-water emulsion,enhanced ?ux,carbon nanotube,composite
更新于2025-09-10 09:29:36
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[IEEE 2018 76th Device Research Conference (DRC) - Santa Barbara, CA, USA (2018.6.24-2018.6.27)] 2018 76th Device Research Conference (DRC) - Exploring Silver Contact Morphologies in Printed Carbon Nanotube Thin-Film Transistors
摘要： Demand for ubiquitous and flexible electronics to facilitate the rapid growth of Internet-of-Things (IoT) technologies has driven the advancement of printed electronics for low-cost and high-throughput manufacturing. The carbon nanotube thin-film transistor (CNT-TFT) is one of the most promising options for printed electronics due to its mechanical flexibility, compatibility with low-temperature fabrication, and relatively high mobility [1]. Meanwhile, Ag nanoparticles remain the most widely used conductive material in printed inks due to their superb dispersion stability, high conductivity, and relatively low cost [2]. However, limited studies have explored the impact of different printed metallic contacts in CNT-TFTs [3], even though the contact interfaces are one of the leading factors limiting performance. In this work, the impact of Ag contact morphology is studied for the first time by fabricating hundreds of CNT-TFTs using an aerosol jet printer to systematically investigate three morphologies (nanoparticle (NP), nanoflake (NF), and nanowire (NW), as seen in Fig. 1) and their impact on device performance. Using what is learned from the contact morphology results, the first CNT-TFTs printed without removal of the substrate from the printer (full “print-in-place” additive devices) are also demonstrated.
关键词： printed electronics,aerosol jet printer,contact morphology,carbon nanotube thin-film transistor,Ag nanoparticles
更新于2025-09-10 09:29:36
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Effect of carbon nanotubes and carbon nanotubes - gold nanoparticles composite on the photocatalytic activity of TiO <sub/>2</sub> and TiO <sub/>2</sub> -SiO <sub/>2</sub>
摘要： Carbon nanotube (CNT) - gold (Au) nanoparticle (NP) nanocomposite was synthesized by simultaneously reducing the Au ions and depositing Au NPs on the surface of CNT. The functional groups were investigated with FT-IR spectra. From the Raman spectra, D-band and G-band of CNT were identified. As a result, the deposition of nanometer-sized Au NPs on the CNT sites was observed from the transmission electron microscope (TEM) images. The photodegradation of methylene blue (MB) in aqueous solutions was studied using various photocatalysts, including TiO2, TiO2-SiO2, CNT/TiO2, CNT/TiO2-SiO2, Au/TiO2, CNT-Au/TiO2 and CNT-Au/TiO2-SiO2 composites. The CNT addition (2%) leads to a synergic effect, improving the photoactivity of the catalysts. A possible physically-based mechanism was proposed involving the reduction of electron-hole recombination and fast electron-transfer possibility.
关键词： Gold nanoparticle,TiO2-SiO2,TiO2,Carbon nanotube,nano-photocatalysts
更新于2025-09-10 09:29:36
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Electromagnetic interference shielding properties of graphene/MWCNT hybrid buckypaper
摘要： A type of lightweight and flexible graphene/multi-walled carbon nanotube (MWCNT) hybrid buckypaper (BP) is fabricated, which show superior shielding effectiveness (SE) of electromagnetic interference and without polymer. The EMI SE of graphene/MWCNT hybrid BP with thickness of 130 μm is up to ～51 dB at 8 GHz, which is much higher than that of pure MWCNT BP with same thickness (～32.5 dB) and the best electrical conductivity is up to 10,000 S/m. More important, the improvement in EMI SE is contributed to the SE absorption, while the SE reflection is almost unchanged. This paper-like material is smooth, tough, and flexible enough to be attached on the complex curved surface structure. A facile way to fully develop graphene and MWCNT in lightweight and flexible EMI shielding materials and devices is provided here.
关键词： buckypaper,flexible,lightweight,multi-walled carbon nanotube,graphene,electromagnetic interference shielding
更新于2025-09-10 09:29:36
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Preparation of activated carbon nanotube foams loaded with Ag-doped TiO2 for highly efficient photocatalytic degradation under UV and visible light
摘要： Titanium oxide (TiO2) has been widely investigated as a photocatalytic material for degradation of organic pollutant in waste water. However, nanosized granular TiO2 nanoparticles are hard to be recycled and re-utilized in water and many cause secondary pollution of water. Hence, we constructed a foam-like photocatalyst, which was composed of carbonaceous support: activated carbon nanotube foams and Ag-doped TiO2 nanoparticles through a method of a template synthesis and carbonization strategy. The as-prepared photocatalyst evidenced to be hierarchical macroporous and mesoporous and exhibited remarkable photocatalytic performance toward the degradation of unsymmetrical dimethylhydrazine under UV and visible light. The structure characterization and photocatalytic performance investigation confirmed that the enhanced photoresponse was attributed to the high efficiency of charge separation and the surface plasmon resonance effect of metallic Ag. The adsorption synergetic effect of the hierarchical porous structure also played an important role in photodegradation. The as-prepared photocatalyst showed great potential in the treatment of waste water containing organic pollutant.
关键词： Ag-doped TiO2,Photocatalytic degradation,Activated carbon nanotube foams,Unsymmetrical dimethylhydrazine,UV and visible light
更新于2025-09-10 09:29:36
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All solution-based heterogeneous material formation for p-n junction diodes
摘要： All solution-based devices have potential as the next class of macroscale and multifunctional electronics on versatile amorphous substrates. Different methods and materials have been studied to control the formation of p-type and n-type semiconducting materials because forming active materials for transistors and sensors remains challenge. This study proposes an approach for solution-based devices in which a p-n junction diode is fabricated using a solution-based InZnO (IZO) thin film for the n-type semiconductor and a carbon nanotube (CNT) network film for the p-type semiconductor. Additionally, the barrier height (~160 meV) is extracted and a p-n junction diode on a plastic film is demonstrated. Although the performance requires further improvements by modifying the interfaces, this printing method may be an interesting approach for all-printed electronics, which can replace conventional Si electronics.
关键词： flexible device,hetero-junction,diode,InZnO,carbon nanotube
更新于2025-09-10 09:29:36
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A CNT-coated refractive index sensor based on Michelson interferometer with thin-core fiber
摘要： A refractive index sensor, which is based on Michelson interferometer (MI) with a thin core fiber (TCF) coated by CNT (Carbon Nanotube), is proposed and experimentally demonstrated. This sensor is fabricated by the splice of a sectioned single mode fiber (SMF) on one end of TCF, and the other end is turned into a circular arc by fusion discharge. Such an all-fiber MI incorporates an intermodal interference between the core mode and the cladding modes. CNT is coated on the surface of the TCF. With the variations inside the environmental refractive index (RI), the shift of the wavelength and intensity of the interference pattern have been brought about. Experimentally, sensitivity of 178.88 dB/RIU (refractive index unit), 165.77 nm/RIU, as well as a resolution of 5.59 × 10?4 RIU, are achieved respectively within a field ranging from 1.334 to 1.371 RIU. Moreover, CNT is better than silicon materials in compatibility, and it will not be washed away after its being adsorbed to the surface of optical fibers. In addition, its application could be better implemented in actual measurements, due to its insensitivity to temperature.
关键词： Michelson interferometer,Thin core fiber,Carbon nanotube
更新于2025-09-09 09:28:46
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A Bottom-Up Approach to Solution-Processed, Atomically Precise Graphitic Cylinders on Graphite
摘要： Extended carbon nanostructures, such as carbon nanotubes (CNTs), exhibit remarkable properties but are difficult to synthesize uniformly. Herein, we present a new class of carbon nanomaterials constructed via the bottom-up self-assembly of cylindrical, atomically-precise small molecules. Guided by supramolecular design principles and circle packing theory, we have designed and synthesized a fluorinated nanohoop that, in the solid-state, self-assembles into nanotube-like arrays with channel diameters of precisely 1.63 nm. A mild solution-casting technique is then used to construct vertical “forests” of these arrays on a highly-ordered pyrolytic graphite (HOPG) surface through epitaxial growth. Furthermore, we show that a basic property of nanohoops, fluorescence, is readily transferred to the bulk phase, implying that the properties of these materials can be directly altered via precise functionalization of their nanohoop building blocks. The strategy presented is expected to have broader applications in the development of new graphitic nanomaterials with π-rich cavities reminiscent of CNTs.
关键词： epitaxial growth,nanohoop,self-assembly,carbon nanotube,Cycloparaphenylene,vertical alignment
更新于2025-09-09 09:28:46
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On-Chip Platform for Slack-Free Carbon Nanotube Resonators
摘要： This work describes an on-chip integrated micro-actuator device for slack-free carbon nanotube (CNT) resonators, improving frequency tunability and Q factor and to study non-linear mode interaction. The device fabricated on SOI wafer with low thermal budget (<600 K) encompasses a restricted symmetrical out-of-plane vibration and a stiff in-plane electro-thermal actuator with a displacement of ~112 nm at 2.7 mW. This corresponds to 5.6% of strain for a 2 μm long suspended carbon nanotube. The in-plane mechanical resonance designed to be far from CNT resonances in MHz regime is measured at 209 kHz. The design is optimized for low power consumption, electrical and thermal isolation and is customized for dry transfer of CNTs.
关键词： carbon nanotube,micro-actuator,strain-sensor,resonator
更新于2025-09-09 09:28:46
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High-performance interactive analysis of split aptamer and HIV-1 Tat on multiwall carbon nanotube-modified field-effect transistor
摘要： Interaction between split RNA aptamer and the clinically important target, HIV-1 Tat was investigated on a biosensing surface transduced by functionally choreographed multiwall carbon nanotubes (MWCNTs). Acid oxidation was performed to functionalize MWCNTs with carboxyl functional groups. X-ray photoelectron spectroscopy analysis had profound ~2.91% increment in overall oxygen group and ~1% increment was noticed with a specific carboxyl content owing to C=O and O–C=O bonding. The interaction between split RNA aptamer and HIV-1 Tat protein was quantified by electrical measurements with the current signal (Ids) over a gate voltage (Vgs). Initially, 34.4 mV gate voltage shift was observed by the immobilization of aptamer on MWCNT. With aptamer and HIV-1 Tat interaction, the current flow was decreased with the concomitant gate voltage shift of 23.5 mV. The attainment of sensitivity with split aptamer and HIV-1 Tat interaction on the fabricated device was 600 pM. To ensure the genuine interaction of aptamer with HIV-1 Tat, other HIV-1 proteins, Nef and p24 were interacted with aptamer and they displayed the negligible interferences with gate voltage shift of 3.5 mV and 5.7 mV, which shows 4 and 2.5 folds lesser than HIV-1 Tat interaction, respectively.
关键词： Field effect transistor,Multiwall carbon nanotube,Split aptamer,HIV-1 Tat
更新于2025-09-09 09:28:46