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Photo-controlled Dopamine Polymerization on DNA Origami with low Nanometer Resolution
摘要： Temporal and spatial control over polydopamine formation on the nanoscale can be achieved by installing an irradiation-sensitive polymerization system on DNA origami. Precisely distributed G-quadruplex structures on the DNA template serve as anchors for embedding the photosensitizer protoporphyrin IX, which — upon the irradiation with visible light — induces a multistep oxidation from dopamine to polydopamine, producing polymeric structures on designated areas within the origami framework. The photochemical polymerization process allows the exclusive control over polydopamine layer formation, which is adjusted by simply switching the light source on and off. The obtained polymer–DNA hybrid material shows significantly enhanced stability properties paving the way for biomedical and chemical applications that are commonly prohibited by the sensitivity of DNA.
关键词： DNA origami,DNA nanotubes,Photopolymerization,Polydopamine,Stability in water
更新于2025-09-11 14:15:04
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Ceramic Matrix Composites (Materials, Manufacturing and Engineering) || 5. Carbonaceous nanomaterials for hybrid organic photovoltaic application
摘要： The deployment of renewable energy sources is crucial for moving towards a sustainable society. In this context, photovoltaic (PV) solar energy conversion is a clean and practical technology with huge potential. However, it is not yet widely deployed; PV efficiency optimization and cost reductions could significantly expedite the uptake of novel solar technologies. To meet future PV power requirements it will be necessary to move toward innovative device design and ultimately new material systems. To this end, new approaches for solar energy conversion are being explored, including organic solar cells (OSCs) that offer the opportunity to diversify PV technologies. Organic and hybrid solar cells are poised to play a significant role in realizing long-term scenarios for sustainable and efficient sources of energy. Although the power conversion efficiency of OSCs is still considerably below that attainable by their inorganic semiconductor-based counterparts, other desirable characteristics, such as flexibility and low weight, make them ideal for specific niche applications, such as their integration into buildings (i.e. on roofs and semitransparent windows) and may ultimately allow the development of viable OPV sources for space applications.
关键词： photovoltaic,carbon nanotubes,organic solar cells,renewable energy,graphene
更新于2025-09-11 14:15:04
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Design of Refolding DNA Aptamer on Single-Walled Carbon Nanotubes for Enhanced Optical Detection of Target Proteins
摘要： DNA aptamer conjugated single-walled carbon nanotube (Aptamer-SWNT) hybrids have demonstrated effective optical biosensors because of its high selectivity and specificity to a target protein, however, the understanding of SWNT hybridization with an aptamer forming a secondary or tertiary structure is still lacking. We study wrapping methods dependent optical biosensing modulation by insulin and platelet-derived growth factor (PDGF) using the Aptamer-SWNT hybrids and the Aptamer-Anchor-SWNT hybrids with a periodically sequenced single-stranded DNA (ssDNA) as anchoring phases. We observe that the refolding nature of the aptamer and its combination with an anchoring phase are critical to the hybridization, where the remarkable optical sensing properties are attributed to the wrapping procedures including the direct wrapping with sonication and the indirect wrapping through dialysis. The tetrameric parallel-stranded G-quadruplex conformation of insulin binding aptamers (IBA) shows an enhanced fluorescence response quenching when using the directly wrapped Aptamer-Anchor-SWNT hybrids. In addition, helix-structural refolding of PDGF binding aptamers (PBA) on the SWNT vicinity under the indirect wrapping exhibits anchoring length-dependent optical modulation. Furthermore, the consecutive centrifuging processes with the indirect wrapping demonstrate fluorescence response brightening, in which the diameter dependent brightening effect is observed by aptamer-protein interactions. This study provides an understanding the underlying conjugation nature of both the Aptamer-SWNT and the Aptamer-Anchor-SWNT hybrids formation, facilitating exceptional optical sensing modules with consideration of refolding feature of aptamers, selection of anchoring phases, wrapping methods and centrifuging process, and the hybridization voyage for DNA-SWNT platforms maneuvers their outcoming optical biosensing capabilities.
关键词： insulin,single-walled carbon nanotubes,PDGF,wrapping methods,optical biosensing,DNA aptamer
更新于2025-09-11 14:15:04
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Laser-Induced Deposition of Carbon Nanotubes in Fiber Optic Tips of MMI Devices
摘要： The integration of carbon nanotubes (CNTs) into optical fibers allows the application of their unique properties in robust and versatile devices. Here, we present a laser-induced technique to obtain the deposition of CNTs onto the fiber optics tips of multimode interference (MMI) devices. An MMI device is constructed by splicing a section of no-core fiber (NCF) to a single-mode fiber (SMF). The tip of the MMI device is immersed into a liquid solution of CNTs and laser light is launched into the MMI device. CNTs solutions using water and methanol as solvents were tested. In addition, the use of a polymer dispersant polyvinylpyrrolidone (PVP) in the CNTs solutions was also studied. We found that the laser-induced deposition of CNTs performed in water-based solutions generates non-uniform deposits. On the other hand, the laser-induced deposition performed with methanol solutions generates uniform deposits over the fiber tip when no PVP is used and deposition at the center of the fiber when PVP is present in the CNTs solution. The results show the crucial role of the solvent on the spatial features of the laser-induced deposition process. Finally, we register and study the reflection spectra of the as-fabricated CNTs deposited MMI devices.
关键词： multimode interference,carbon nanotubes,laser-induced deposition,optical fibers
更新于2025-09-11 14:15:04
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Multiwalled carbon nanotube based aromatic volatile organic compound sensor: sensitivity enhancement through 1-hexadecanethiol functionalisation
摘要： Aromatic volatile organic compound (VOC) sensors are attracting growing interest as a response to the pressing market need for sensitive, fast response, low power consumption and stable sensors. Benzene and toluene detection is subject to several potential applications such as air monitoring in chemical industries or even biosensing of human breath. In this work, we report the fabrication of a room temperature toluene and benzene sensor based on multiwall carbon nanotubes (MWCNTs) decorated with gold nanoparticles and functionalised with a long-chain thiol self-assembled monolayer, 1-hexadecanethiol (HDT). High-resolution transmission electron microscopy (HRTEM) and Fourier transform infrared spectroscopy (FTIR) were performed to characterize the gold nanoparticle decoration and to examine the thiol monolayer bonding to the MWCNTs. The detection of aromatic vapours using Au-MWCNT and HDT/Au-MWCNT sensors down to the ppm range shows that the presence of the self-assembled layer increases the sensitivity (up to 17 times), selectivity and improves the response dynamics of the sensors.
关键词： multiwall carbon nanotubes (MWCNTs),vapour sensor,sensitivity,gold-decorated MWCNTs,self-assembled monolayers (SAMs),selectivity
更新于2025-09-11 14:15:04
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Self-assembly of single-walled carbon nanotubes arrays with different line width
摘要： Single-walled carbon nanotubes (SWNTs) are one of the most promising nanoelectronic materials, However, there are still some application challenges, including purification, regular arrangement, interconnection, and so on. There is evidence that the array assembly can improve the performance of SWNTs. In this work, we develop a line-width controllable large-scale assembly of SWNTs based on aqueous solution, using electron beam (E-beam) lithography to construct self-assembled templates. The results show that SWNTs arrays of different line-width are obtained, which is possible to design the structure of SWNTs assembly to meet different functions.
关键词： Single-walled carbon nanotubes (SWNTs),self-assembly,line-width,electron beam (E-beam) lithography
更新于2025-09-11 14:15:04
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Enhanced Charge Carrier Transport in 2D Perovskites by Incorporating Single-Walled Carbon Nanotubes or Graphene
摘要： Two-dimensional (2D) organic-inorganic (hybrid) perovskites are considered promising candidates to replace conventional three-dimensional (3D) perovskites for solar cell applications as they have good resistance against moisture and UV light. However, the use of 2D perovskite is associated with a significant decrease in power efficiency resulting from their low photogenerated charge carrier density and poor charge transport. To improve power efficiency in 2D perovskites, highly crystalline films (near-single-crystal quality) of 2D perovskite needs to be synthesized where the alignment of the inorganic perovskite components is controlled to have vertical alignment with respect to the contacts to improve charge transport. In this work, we explored strategies to overcome this limitation, by integrating 2D perovskite with single-walled carbon nanotubes or graphene to enable more efficient extraction of charge carriers toward electric contacts. Longer carrier lifetimes were achieved after the incorporation of the carbon nanostructures in the films and at cell level, power efficiency increased by two-fold.
关键词： 2D perovskites,charge-carrier transport,solar cells,single-walled carbon nanotubes,graphene
更新于2025-09-11 14:15:04
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Single‐Photon Emission: Brightening and Guiding Single‐Photon Emission by Plasmonic Waveguide–Slit Structures on a Metallic Substrate (Laser Photonics Rev. 13(10)/2019)
摘要： In this work, we report a new mixed-extractor strategy to improve the sorting yield of large-diameter semiconducting single-walled carbon nanotubes (s-SWCNTs) with high purity. In the new mixed-extractor strategy, two kinds of conjugated polymers with different rigidity, poly(9,9-n-dihexyl-2,7-fluorene-alt-9-phenyl-3,6-carbazole) (PDFP) and poly(9,9-dioctylfluorene-alt-benzothiadiazole) (P8BT), are used to sort large-diameter s-SWCNTs through two simple sonication processes. To our surprise, although PDFP itself shows no selectivity toward s-SWCNTs, it can greatly enhance the sorting yield of P8BT. Using the PDFP/P8BT mixed-extractor method, the yield of sorted s-SWCNTs has been enhanced by 5 times with a purity above 99 % in comparison to that using P8BT single-extractor method. In addition, the photoluminescence (PL) excitation maps shows that the PDFP/P8BT mixed-extractor system not only enhances the sorting yield substantially, but also tends to be enrichment of (15,4) SWCNTs with the diameter of 1.36 nm.
关键词： mixed-extractor,high yield and high purity sorting,carbon nanotubes,polymer
更新于2025-09-11 14:15:04
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The Influence of Single-Walled Carbon Nanotubes on the Dynamic Properties of Nematic Liquid Crystals in Magnetic Field
摘要： This article aims to study the impact of carbon nanotube dispersions in liquid crystals. A theoretical model for the system’s dynamics is presented, considering the elastic continuum theory and a planar alignment of liquid crystal molecules on the nanotube’s surface. Experimental calculation of the relaxation times in the magnetic field was made for two cases: when the field was switched on (τon), and when it was switched off (τoff). The results indicate an increase of the relaxation time by about 25% when the magnetic field was switched off, and a smaller increase (about 10%) when the field was switched on, where both were in good agreement with the theoretical values.
关键词： liquid crystals,nanotubes,Freedericksz transition
更新于2025-09-11 14:15:04
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Boron Nitride Nanotubes in Nanomedicine || Optical properties of boron nitride nanotubes: potential exploitation in nanomedicine
摘要： Nanotechnology is the ability and the art of exploiting nanometer-scale control on the size and the shape of a system, in order to obtain novel physicochemical properties. Chemical reactivity, optical response, and interactions with cells and tissues of nanotailored materials can be remarkably different from those of the bulk counterpart. The application of this flexibility and of the enormous potential that it brings along to the treatment, prevention, or diagnosis of diseases—that is, nanomedicine—is a novel opportunity that in spite of its young age is already representing a market valued at almost 80 billion USD in 2012 [1], with hundreds of nanomedicines and nanoformulations which are either approved or under clinical evaluation [2]. In the class of nanomaterials, boron nitride nanotubes (BNNTs) possess unique characteristics that make them particularly appealing. BNNTs are structural equivalents of carbon nanotubes (CNTs) with boron and nitrogen atoms replacing the carbon atoms of CNTs, and can be thought as a rolled sheet of hexagonal BN (h-BN) as depicted in Fig. 9.1a, b, and d. Despite their structural similarity with CNTs, they are comparable or superior to the latter in terms of several technologically relevant properties such as a thermal conductivity (at least in isotopically pure tubes) [3], thermal [4] and chemical [5] stability, piezoelectricity [6], and mechanical strength [7]. These peculiar advantages stem from the significant ionic component of the covalent bonds between B and N atoms.
关键词： Boron Nitride Nanotubes,Optical Properties,Nanotechnology,Nanomedicine
更新于2025-09-11 14:15:04