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Isophorone-boronate ester: A simple chemosensor for optical detection of fluoride anion
摘要： A highly selective isophorone‐boronate ester based chemosensor, (1), having a dicyanovinyl moiety as a convenient colorimetric probe, has been designed. Different types of anionic analyte such as CH3COO?, Br?, Cl?, ClO4? and HSO4?, PF6? were tested and among them only highly nucleophilic F? anion displayed significant response towards the sensor. Addition of the fluoride anion across the boron atom disrupts the π‐conjugation thereby shifts the absorption wavelength towards the redshift region due to the decrease in the HOMO‐LUMO energy gap and a colour change from yellow to blue is observed under visible light condition. The detection limit of this probe was calculated to be 3.25 × 10?8 M for fluoride anion. The binding constants and the detection limits of the sensor were calculated using absorption titration studies. The silica gel TLC strips dip‐coated by the chemosensor (1) revealed a colour change from yellow to brick red to naked eye.
关键词： chemosensor,boron derivatives,optical Spectroscopy,fluoride anion sensing
更新于2025-09-09 09:28:46
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Recent progress in synthesis, properties and applications of hexagonal boron nitride based heterostructures
摘要： Featuring an absence of dangling bonds, large band gap, low dielectric constant, excellent chemical inertness, atomically thin hexagonal boron nitride (h-BN) is considered as an ideal candidate for the integration with graphene and other 2D materials. During the past years, great efforts have been devoted to the research area of h-BN based heterostructures from fundamental study to practical applications. In this review, we summarize the recent progress in the synthesis, novel properties and potential applications of h-BN based heterostructures, especially the synthesis technique. Firstly, various approaches for the preparation of both in-plane and vertical stacked h-BN based heterostructures are introduced in detail, including top-down strategies associated with exfoliation-transfer processes and bottom-up strategies such as chemical vapor deposition (CVD)-based growth. Secondly, we discuss some novel properties arise in these heterostructures. Then, several promising applications in electronic and optoelectronic devices based on these heterostructures are also reviewed. Finally, we discuss the main challenges and possible research directions in this field.
关键词： heterostructures,application,hexagonal boron nitride,property,synthesis
更新于2025-09-09 09:28:46
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[IEEE 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Shanghai (2018.8.8-2018.8.11)] 2018 19th International Conference on Electronic Packaging Technology (ICEPT) - Facile Preparation of Silver Nanoparticles Decorated Boron Nitride Nanotube Hybrids
摘要： Blending polymer with thermally conductivity Metal nanoparticles-fillers, which can reducing ITR at a high fillers contents, have recently attracted intense attention. The interfacial thermal resistance (ITR) between fillers at a high filler doping contents causes a limited improvement of thermal conductivity. Fortunately, silver nanoparticles decorated fillers have potential to improve thermally conductivity by reducing ITR between fillers at a high filler content. However, how to fabricate pony-size silver nanoparticles decorated fillers hybrids simply is still a challenge. Herein, we report a facile synthesis of decorating boron nitride nanotube (BNNT) hybrids with AgNP (10-20 nm) by replacing between the Ag+ and -OH on the defect sites of BNNT. This strategy is a viable way to prepare metal nanoparticles-fillers which can be used in highly thermal conductivity.
关键词： boron nitride nanotube,thermal conductivity,hybrids,silver nanoparticles,interfacial thermal resistance
更新于2025-09-09 09:28:46
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Lewis-Acid-Catalyzed BODIPY Boron Functionalization Using Trimethylsilyl Nucleophiles
摘要： A novel and straightforward strategy for boron functionalization in boron dipyrromethenes (BODIPYs) is developed. In particular, this synthetic strategy provides new possibilities for the synthesis of sp2 N-substituted (B-NCS and -NCO), benzotriazole- and trifluoroacetamide-substituted BODIPYs that were hitherto unknown. These new BODIPYs display an array of highly desirable photophysical properties (0.04 < Φ f < 0.86), paving the road for further investigations in material applications.
关键词： photophysical properties,boron functionalization,trimethylsilyl nucleophiles,Lewis acid catalysis,BODIPY
更新于2025-09-09 09:28:46
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Influence of Defects in Boron Nitride Nanotubes in the Adsorption of Molecules. Insights from B3LYP-D2* Periodic Simulations
摘要： The adsorption of H2O, NH3 and HCOOH as polar molecules and C6H6 and CH4 as non-polar ones on a series of zig-zag (6,0) single-walled boron nitride nanotubes (BNNTs) both being defect-free (P_BNNT) and containing defects at the nanotube walls has been studied by means of B3LYP-D2* periodic calculations. We focused on defects derived from monovacancies of B (N-rich_BNNT) and N (B-rich_BNNT) atoms and also on Stone-Wales defects (SW_BNNT). The adsorption of polar molecules with defective BNNTs is generally based on dative interactions and H-bonding, and their adsorption energies strongly depend on the type of BNNT. N-rich_BNNT is the most reactive nanotube towards adsorption of polar molecules, as in all cases deprotonation of the polar molecules is spontaneously given upon adsorption. The strength in the adsorption energies is followed by B-rich_BNNT, SW_BNNT and P_BNNT. Adsorption of non-polar molecules is mainly dictated by dispersion interactions, and, accordingly, the adsorption energies are almost constant for a given molecule irrespective of the type of nanotube.
关键词： adsorption,vacancies,periodic simulations,boron nitride nanotubes,DFT,Stone-Wales defect
更新于2025-09-09 09:28:46
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Morphology and Structure Properties of Boron-doped Diamond Films Prepared by Hot Cathode Direct Current Plasma Chemical Vapor Deposition
摘要： Boron-doped diamond (BDD) films were deposited by hot cathode direct current plasma chemical vapor deposition (HCDC-PCVD) according to various mixture ratios of CH4/H2/B(OCH3)3 gas. The Raman performances and surface morphologies of the BDD films were then characterized by Raman spectroscopy and scanning electron microscopy (SEM). Results indicated that the flow rate of B(OCH3)3 had marked effects on the growth characteristics of the produced boron-doped diamond films. The presence and concentration of the doped boron atoms significantly altered both the surface morphologies and structures of the diamond films. With increasing flow rate of B(OCH3)3, the crystal grain surfaces became smooth as visible under SEM. The B-doping levels in these films increased from 1.75 × 1019 cm-3 to a maximum of 2.4 × 1021 cm-3, estimated from the Raman spectra.
关键词： structural properties,boron-doped diamond (BDD) films,hot cathode direct current PCVD (HCDC-PCVD)
更新于2025-09-09 09:28:46
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Green and Efficient Production of Boron Nitride Nanosheets via Oxygen Doping-Facilitated Liquid Exfoliation
摘要： As the structural analogue of graphene, boron nitride nanosheets (BNNSs) are anticipated to have a wide range of potential applications. BNNSs exhibit good mechanical properties, outstanding thermal conductivity, oxidation and chemical stability and are excellent electrical insulators. While BNNSs have gained recognition as one of the most versatile 2D materials in recent years, their application in research and industry is still hampered by the lack of methods to produce BNNSs in large quantity and a cost-effective way. In this study, we report highly efficient h-BN exfoliation via the oxygen doping-facilitated liquid exfoliation. Oxygen atoms are introduced into the hexagonal boron nitride (h-BN) structure via a facile thermal treatment. The relationship of thermal treatment, structural changes and h-BN exfoliation are studied to elucidate the key factor for advancing the BNNS production. The optimum concentration of hydroxyl groups and weakening of interlayer interactions have synergistically facilitated the delamination of h-BN in water under mild exfoliation conditions, resulting in up to 1255% yield increment and without noticeable new defects in the BNNS structure as compared with the untreated control. An efficient and environmentally friendly exfoliation process of h-BN is a crucial starting point towards the cost-effective and mass production of BNNSs which is needed for the currently identified and myriad future applications of BNNSs.
关键词： oxygen-doping,nanoplatelets,boron nitride nanosheets,2D nanomaterials
更新于2025-09-09 09:28:46
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AIP Conference Proceedings [Author(s) 6TH INTERNATIONAL CONFERENCE ON PRODUCTION, ENERGY AND RELIABILITY 2018: World Engineering Science & Technology Congress (ESTCON) - Kuala Lumpur, Malaysia (13–14 August 2018)] - Investigation of optical and electrical properties of nitrogen- and boron-doped carbon dots films
摘要： The optical properties of two types of carbon dots (CDs) doped by nitrogen and boron atoms and the electrical properties of ?lms from the obtained CDs in a polyvinyl alcohol (PVA) matrix were investigated. Synthesis of CDs was carried out using the hydrothermal treatment method. The resulting CDs have a crystalline structure with functional groups on the edges and surface (lateral sizes of CDs is vary in the range of ～7 ?28 nm). The thin ?lms from aqueous suspensions of CDs were obtained by the spin-coating method inside an electrically inert polymer matrix of PVA. The current-voltage characteristics of this obtained ?lms were measured.
关键词： optical properties,polyvinyl alcohol matrix,current-voltage characteristics,carbon dots,electrical properties,spin-coating method,hydrothermal treatment,nitrogen-doped,boron-doped
更新于2025-09-09 09:28:46
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Enhanced Photocatalytic Activity of B, N-Codoped TiO <sub/>2</sub> by a New Molten Nitrate Process
摘要： B, N-codoped titania mesoporous crystals were prepared by the sol–gel method followed by a molten nitrate process to modify the sample morphology. The composition, morphology and microstructure of the obtained samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS), Brunauer Emmett Teller (BET), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and selected area electron diffraction (SAED). Fourier Transform Infrared spectroscopy (FTIR) revealed weak complex vibrations between the Ti–O oxide species and the unsaturated sites (Ti3+) through the incorporation of hydroxyl groups, which was not observed in the bulk titania (B–N–TiO2). The photocatalytic reactivity of boron-nitrogen codoped TiO2 was examined for the removal of methylene blue (MB) under visible light irradiation. The nitrates treated B-doped TiO2 exhibited better photocatalytic activity for dye degradation than that of B-doped TiO2 and nitrates treated TiO2. The best performance was obtained in the sample treated at a calcination temperature of 550 °C.
关键词： Photocatalysis,Visible Light,Nitrate,Boron Doped Titanium Dioxide
更新于2025-09-09 09:28:46
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Synthesis and photoluminescence properties of hexagonal BGaN alloys and quantum wells
摘要： Hexagonal boron nitride (h-BN) has emerged as an important extreme bandgap semiconductor as well as a two-dimensional material. Achieving the ability for tuning the optoelectronic properties through alloying and heterojunction will further expand the applications of h-BN. By utilizing h-BN epilayer as a template, the synthesis of BN-rich B1?xGaxN alloys and quantum wells crystalized in the hexagonal phase has been demonstrated for the first time by metal organic chemical vapor deposition. The incorporation of Ga tends to enhance the conductivity. A blue shift in the band-edge emission upon the formation of h-BN/BGaN/BN QW has been observed, indicating the feasibility for heterojunction formation.
关键词： hexagonal boron nitride,MOCVD,photoluminescence,BGaN alloys,quantum wells
更新于2025-09-09 09:28:46