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Two Novel Heteropolyniobates Using TeO <sub/>3</sub><sup>2–</sup> as Template and Linker
摘要： By adopting di?erent crystal growth methods, two novel organic?inorganic hybrids, [{Cu(phen)}6(H2O)(Te5Nb15.5Cu0.5O57)]3.5? and its dimer, have been successfully synthesized. These are fabricated by simple compound reactions and directed by the tellurite anions, which act as heteroanion templates and linkers, as well as a pendant ligand. The compounds were characterized by IR spectra, UV/vis, thermogravimetric analysis, and single crystal X-ray di?raction. Furthermore, the solution behavior was also investigated.
关键词： organic?inorganic hybrids,polyoxoniobate clusters,crystal growth methods,tellurite anions,heteropolyniobates
更新于2025-09-23 15:19:57
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Synthesis of organic–inorganic hybrids <i>via</i> a high-pressure-ramp process: the effect of inorganic nanoparticle loading on structural and photochromic properties
摘要： Organic polymerization remains a limiting step in the preparation of organic–inorganic hybrid materials with a strong concentration of the inorganic component. In this work, a high-pressure-ramp process was applied to achieve pHEMA–TiO2 nanoparticulate solids with an unprecedentedly high concentration (12 mol l?1) of the inorganic component, which is four times higher than that obtained after radical polymerization induced thermally or by photons. The inorganic nanoparticles underwent morphological and structural changes with an increase of Ti concentration above 1.5 mol l?1: they slightly coarsen and crystallize into an anatase polymorph. The material possesses a strong photochromic response related to the electron–hole separation at the organic–inorganic interface and can store 1e? per 5 Ti atoms. The electron storage capacity of the titania nanoparticles decreases upon crystallization.
关键词： high-pressure-ramp process,polymerization,TiO2 nanoparticles,photochromic properties,organic–inorganic hybrids
更新于2025-09-19 17:15:36
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[ACM Press the 14th IEEE/ACM International Symposium - Athens, Greece (2018.07.17-2018.07.19)] Proceedings of the 14th IEEE/ACM International Symposium on Nanoscale Architectures - NANOARCH '18 - Programmable Molecular-Nanoparticle Multi-junction Networks for Logic Operations
摘要： We propose and investigate a nanoscale multi-junction network architecture that can be configured on-flight to perform Boolean logic functions at room temperature. The device exploits the electronic properties of randomly deposited molecule-interconnected metal nanoparticles, which act collectively as strongly nonlinear single-electron transistors. Disorder is being incorporated in the modeling of their electrical behavior and the collective response of interacting nano-components is being rationalized. The non-optimized energy consumption of the synaptic grid for a "then-if" logical computation is in the range of few aJ.
关键词： percolation,nonlinear single electron transistors,multi-junction networks,botton-up designless networks,nanoelectrodes,Molecular-Nanoparticle hybrids,Boolean logic operations
更新于2025-09-19 17:15:36
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Synthesis, crystal structure and photochromic property of a phenethyl viologen bismuth(III) chloride
摘要： Viologen bismuthate halides generally show photochromic properties. In the present work, phenylethyl alcohol was introduced into chloro bismuthates in the hope to prepare photochromic crystalline materials and finally a photochromic inorganic-organic hybrid, (PeV)3(Bi2Cl9)2 (1), based on (PeV2+ = phenethylviologen = N,N′-diphenethyl-4,4′-bipyridinium), has been obtained, whose microstructure contains a discrete dimer [Bi2Cl9]3– counterion identified by single crystal X-ray diffraction. More importantly, 1 exhibits a typical photochromic behavior, which can be mainly attributed to the reversible inter-conversion between the monocation viologen radical [PeV]+? and the viologen dication [PeV]2+.
关键词： π–π Interactions,Inorganic-organic hybrids,Photochromism,Phenethyl viologens
更新于2025-09-19 17:15:36
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Hybrid TiO2-ZnO Nanomaterials Prepared Using Laser Ablation in Liquid
摘要： Hybrids of semiconductor nanomaterials often demonstrate properties that are superior to those of their components. In this study, we prepared hybrid nanomaterials of TiO2 and ZnO, which are among the most actively studied semiconductors, by means of millisecond-pulsed laser and analyzed how their morphology, particle size, and surface composition depend on preparation conditions. A series of nanomaterials were obtained via sequentially ablating Zn and Ti metal plates (in di?erent sequences) in water, while laser pulses of lower (2.0 J/pulse) and higher (5.0 J/pulse) energy were applied. The properties of laser-produced hybrid TiO2-ZnO nanomaterials were shown to be governed by experimental conditions such as laser pulse width, pulse peak power, and reaction media (either pure water or colloid with nanoparticles). The morphology revealed nanospheres of TiO2 that decorate nanorods of ZnO or ?ower-like aggregates of zinc oxide. Intriguingly, after extended ablation time, titania was found to be self-doped with Ti3+ ions, and the contribution of lower oxidation states of titanium could be controlled by the applied laser pulse energy. The physicochemical characteristics of hybrid nanomaterials were compared with pure ZnO and TiO2 prepared under the same laser conditions.
关键词： ZnO nanorods,TiO2 nanospheres,Ti3+ and Ti2+ doped titania,hybrids TiO2-ZnO,XPS
更新于2025-09-19 17:13:59
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Facile large-scaled fabrication of graphene-like materials by ultrasonic assisted shear exfoliation method for enhanced performance on flexible supercapacitor applications
摘要： In this work, we have developed a rapid and simple approach for fabrication of graphene-like materials. It consisted of shearing commercial graphite in aqueous solution with the assistance of ultrasonication. The results showed that the graphene-like materials were successfully fabricated with not only similar flake structure of graphene, but also improved conductivity. For the applications of flexible supercapacitors, the as-prepared graphene-like materials showed better specific capacitance than commercial graphite as the working electrode. In addition, the rate capability of the flexible supercapacitor device is 80% and the capacitance retention reaches 90% after 10,000 cycles. The high flexibility of the as-fabricated graphene-like materials gives rise to high flexibility of all-solid-state supercapacitors, and the specific capacitance was not affected by bending state. The as-fabricated supercapacitor further demonstrated that it can drive the resistive pressure sensor and the voltage was stable at a fixed value under different values of pressure.
关键词： Graphene-like structure,Ultrasonic assisted shear exfoliation,Supercapacitor/resistive pressure sensor hybrids,Flexible supercapacitor
更新于2025-09-19 17:13:59
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Positional Isomerism Controlled Electronic and Photochromic Properties of Naphthalene Diimide-Based Chlorozincate Hybrids
摘要： Two organic-inorganic hybrids, [3-H2DPNDI][ZnCl4]·0.5H2O (1) and [4-H2DPNDI][ZnCl4]·0.5H2O (2) (3-H2DPNDI2+ = protonated N, N-di(3-pyridyl)-1,4,5,8-naphthalene diimide, 4-H2DPNDI2+ = protonated N, N-di(4-pyridyl)-1,4,5,8-naphthalene diimide), have been designed and prepared. Compounds 1 and 2 are constructed from typical [ZnCl4]2- inorganic clusters and positional isomeric organic cations of [H2DPNDI]2+, which are assembled into different 3-D supramolecular networks via different anion-π interactions and hydrogen-bonding interactions. Photochromism of 1 and non-photochromism of 2 are attributable to the usage of positional isomers, which lead to the different spatial stack of [ZnCl4]2- donors and [H2DPNDI]2+ acceptors, suggesting delicate modulating effect of the distinct interfacial contacts on the intermolecular charge transfer/electron transfer and consequently photoresponsive behaviors.
关键词： organic-inorganic hybrids,positional isomerism,anion-π interactions,chlorozincate,photochromism,naphthalene diimide
更新于2025-09-16 10:30:52
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Nanocomposites for Photonic and Electronic Applications || Green photonics integrated circuits based on organica??inorganic hybrids
摘要： Within the last decade, most applications in data communication and storage, as well as sensing, have become highly integrated, leading to an incorporation and adaption of optical components toward high integration levels [1]. For this purpose, photonic integrated circuits (PICs) have attracted a large interest as they contain several optical components in a single chip (all-in-one package), reducing the size, weight, power consumption, and the cost of optical-to-electrical-to-optical conversions [2]. The interest in PICs is also justified by other advantages, such as minimum number of optical fiber connections, high sensitivity, and electromagnetic immunity [3].
关键词： organic-inorganic hybrids,photonic integrated circuits (PICs),Green photonics,optical components,integrated circuits
更新于2025-09-16 10:30:52
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Highly Transparent Contacts to the 1D Hole Gas in Ultrascaled Ge/Si Core/Shell Nanowires
摘要： Semiconductor-superconductor hybrid systems have outstanding potential for emerging high performance nanoelectronics and quantum devices. However, critical to their successful application is the fabrication of high quality and reproducible semiconductor-superconductor interfaces. Here, we realize and measure axial Al-Ge-Al nanowire heterostructures with atomically precise interfaces, enwrapped by an ultra-thin epitaxial Si layer further denoted as Al-Ge/Si-Al nanowire heterostructures. The heterostructures were synthesized by a thermally induced exchange reaction of single-crystalline Ge/Si core/shell nanowires and lithographically defined Al contact pads. Applying this heterostructure formation scheme enables self-aligned quasi one-dimensional crystalline Al leads contacting ultra-scaled Ge/Si segments with contact transparencies greater than 96%. Integration into back-gated field-effect devices and continuous scaling beyond lithographic limitations allows us to exploit the full potential of the highly transparent contacts to the 1D hole gas at the Ge-Si interface. This leads to the observation of ballistic transport as well as quantum confinement effects up to temperatures of 150 K. Low temperature measurements reveal proximity-induced superconductivity in the Ge/Si core/shell nanowires. The realization of a Josephson field-effect transistor allows us to study the sub-gap structure caused by multiple Andreev reflections. Most importantly, the absence of a quantum dot regime indicates a hard superconducting gap originating from the highly transparent contacts to the 1D hole-gas, which is potentially interesting for the study of Majorana zero modes. Moreover, underlining the importance of the proposed thermally induced Al-Ge/Si-Al heterostructure formation technique, our system could contribute to the development of key components of quantum computing such as gatemon or transmon qubits.
关键词： 1D hole gas,hard superconducting gap,transparent contacts,superconductor-semiconductor hybrids,nanowire heterostructure,germanium
更新于2025-09-12 10:27:22
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Highly Responsive Ultraviolet Sensor Based on ZnS Quantum Dot Solid with Enhanced Photocurrent
摘要： Detection of visible blind UV radiation is not only interesting but also of technologically important. Herein, we demonstrate the efficient detection of UV radiation by using cluster like ZnS quantum dot solid nanostructures prepared by simple reflux condensation technique. The short-chain ligand 3-mercaptopropionic acid (MPA) involved in the synthesis lead to the cluster like formation of ZnS quantum dots into solids upon prolonged synthesis conditions. The ZnS QD solid formation resulted in the strong delocalization of electronic wave function between the neighboring quantum dots. It increases the photocurrent value, which can be further confirmed by the decrease in the average lifetime values from 64 to 4.6 ns upon ZnS cluster like QD solid formation from ZnS QDs. The ZnS quantum dot solid based UV sensor shows good photocurrent response and a maximum responsivity of 0.31 (A/W) at a wavelength of 390 nm, is not only competitive when compared with previous reports but also better than ZnS and metal oxide-based photodetectors. The device exhibits a high current value under low-intensity UV light source and an on/off ratio of IUV/Idark = 413 at zero biasing voltage with a fast response. Further, photocurrent device has been constructed using ZnS quantum dot solid nanostructures with graphene hybrids as an active layer to improve the enhancement of photoresponsivity.
关键词： graphene hybrids,ZnS quantum dot solid,photoresponsivity,UV sensor,photocurrent
更新于2025-09-12 10:27:22