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Stretchable and Higha??Adhesive Plasmonic Metasheet Using Al Subwavelength Grating Embedded in an Elastomer Nanosheet
摘要： Plasmonic metasurfaces have attracted much attention for use in device applications over the past decade. Dynamic color tuning (DCT), where the displacement of periodic nanostructures is controlled to generate different colors in real time, is one of the great possibilities of plasmonic metasurfaces for optical strain sensors or display devices. In this study, an Al metasurface embedded in an elastomer nanosheet with film thickness 400 nm is fabricated by means of sacrificial release using a polyvinyl alcohol sacrificial layer. This plasmonic metasheet shows not only the seven colors produced by surface plasmons, but also DCT by stretching the elastomer nanosheet. Each pixel, designed with a grating period of 300–600 nm, emits the bright colors expected in electromagnetic simulation. Moreover, stretching the plasmonic metasheet demonstrates DCT from 495 to 660 nm in the visible light range. The freestanding metasheet with maximum thickness 400 nm may be easily integrated into any active device by post-processing transfer. Stretching the metasheet requires an estimated × 10?3 lower force than previously reported for plasmonic metasurfaces, owing to a film thickness of only several hundreds of nanometers. These results facilitate the realization of microdevices with novel capabilities based on plasmonic metamaterials.
关键词： plasmonic metamaterials,elastomer nanosheets,dynamic color tuning,subwavelength gratings,surface plasmons
更新于2025-09-23 15:21:01
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Nanosheets-assembled Bi2WO6 microspheres with efficient visible-light-driven photocatalytic activities
摘要： The nanosheet-assembled Bi2WO6 microspheres could be successfully synthesized in large quantities by a facile hydrothermal strategy in the presence of surfactant hexadecyl trimethyl ammonium bromide (CTAB) and polyvinylpyrrolidone (PVP) under mild conditions. The morphology and size of as-prepared Bi2WO6 could be readily controlled by adjusting the synthetic parameters such as hydrothermal time. The probable formation mechanism of nanosheet-assembled Bi2WO6 microspheres was discussed in detail. The hierarchical nanosheet-assembled microspheres could be constructed by orderly arranged nanosheets. The photocatalytic activity of the nanosheet-assembled Bi2WO6 microspheres was evaluated by degrading rhodamine B (RhB) under irradiation of visible light. The brilliant photodegradation e?ciency is about 98% under visible light irradiation for 50 min. The results suggest that the as-prepared Bi2WO6 microspheres have good prospects as the photocatalyst for the removal of organic pollutants.
关键词： Hydrothermal,Bi2WO6,Visible light,Nanosheets,Microspheres,Photocatalysis
更新于2025-09-23 15:21:01
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Fabrication and H <sub/>2</sub> -Sensing Properties of SnO <sub/>2</sub> Nanosheet Gas Sensors
摘要： Vertically formed and well-defined SnO2 nanosheets are easy to fabricate, involving only a single process that is performed under moderate conditions. In this study, two different sizes of a SnO2 nanosheet were concurrently formed on a Pt interdigitated electrode chip, with interconnections between the two. As the SnO2 nanosheets were grown over time, the interconnections became stronger. The ability of the fabricated SnO2 nanosheets to sense H2 gas was evaluated in terms of the variation in their resistance. The resistance of a SnO2 nanosheet decreased with the introduction of H2 gas and returned to its initial level after the H2 gas was replaced with air. Also, the response?recovery behaviors were improved as a result of the growth of the SnO2 nanosheets owing to the presence of many reaction sites and strong interconnections, which may provide multipassages for the electron transfer channel, leading to the acceleration of the reaction between the H2 gas and SnO2 nanosheets.
关键词： H2 sensing,single process fabrication,SnO2 nanosheets,gas sensors,electron transfer channel
更新于2025-09-23 15:21:01
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Fe3+-selective and sensitive “on-off” fluorescence probe based on the graphitic carbon nitride nanosheets
摘要： An effective and facile “on-off” fluorescence sensing approach for the determination of Fe3+ ion using a large area and relatively uniform size graphitic carbon nitride nanosheets (GCNS) was developed. The prepared GCNS have blue and stable emission, as well as excellent water dispersion, and were applied as an effective fluorescent probe that based on the quenched fluorescence for selective and sensitive detection of Fe3+ ion. Herein, we explain the ambiguous fluorescence quenching mechanism between the GCNS and Fe3+, which mainly springs from the redox potential and empty d orbital of Fe3+. The redox potential and unfilled d orbit of Fe3+ endow it excellent binding force with GCNS, which generates most obvious fluorescence quenching effect with respect to other metal ions. The limit of detection (LOD) for Fe3+ was found to be about 2.06 μM. Therefore, the prepared GCNS has the potential to be used as a fluorescent probe for detection.
关键词： nanosheets,fluorescence detection,g-C3N4,fluorescence quenching mechanism
更新于2025-09-23 15:21:01
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Synthesis of BiOCl Nanosheets by a Simple Ultrasonic Route
摘要： Ternary bismuth oxyhalide (BiOX, X = F, Cl, Br, I) with layered structure have emerged as promising photocatalysts for water splitting and environmental remediation. Ultrathin BiOCl nanosheets were achieved by a simple ultrasound way. The product was characterized by XRD, SEM and TEM.
关键词： Ultrathin,Nanosheets,BiOX,Ultrasonic
更新于2025-09-23 15:21:01
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Rapid screening detection of fluoroquinolone residues in milk based on turn-on fluorescence of terbium coordination polymer nanosheets
摘要： We report a facile, effective and rapid screening method for the determination of total fluoroquinolones (FQs) in milk using lanthanide coordination polymer nanomaterials as the sensing platform. The non-luminescent coordination polymer nanosheets (CPNSs) used in this work are composed of adenosine monophosphate (AMP) and terbium (Tb3+) ions (AMP/Tb CPNSs). The as-prepared CPNSs were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy and fluorescence techniques. Tb3+ acts as the center ion of the coordination polymer, with AMP assembled through phosphate and amine groups. However, the reaction between FQs and AMP/Tb CPNSs noticeably turns on the fluorescence due to the strong coordination interaction between FQs and Tb3+. Under optimized conditions, the fluorescence intensity of AMP/Tb at 545 nm shows a linear relationship with FQ concentrations between 0.04 μmol/L and 5.0 μmol/L. The relative standard deviation (RSD) of the intraday precision is below 1 %, and detection limits are as low as 0.01 μmol/L. The proposed method was successfully applied to the determination of FQs in milk samples.
关键词： Screening detection,Terbium coordination polymer nanosheets,Fluorescence,Fluoroquinolones
更新于2025-09-23 15:21:01
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Construction of the 0D/2D heterojunction of Ti3C2Tx MXene nanosheets and iron phthalocyanine quantum dots for the impedimetric aptasensing of microRNA-155
摘要： A promising nanocarrier of the complementary DNA (cDNA) toward miRNA-155 was synthesized on the basis of the nanohybrid type of Ti3C2Tx MXene nanosheets decorated using iron phthalocyanine quantum dots (FePc QDs) (denoted as Ti3C2Tx@FePcQDs) to construct a novel ultrasensitive impedimetric aptasensing system for microRNA-155 (miRNA-155). Owing to π–π* stacking interaction between Ti3C2Tx nanosheets and FePc QDs, the homogeneous nanostructure of the Ti3C2Tx@FePcQD nanohybrid that comprises mixed-valence states (Ti2+/Ti3+ and Fe2+/Fe3+), multicomponent (Ti-O and Ti-C), and various N-related groups was achieved. The constructed Ti3C2Tx@FePcQDs-based aptasensor displayed an ultrahigh sensitivity for detecting miRNA-155 with a low detection limit of 4.3 aM (S/N = 3) within the miRNA-155 concentration ranging from 0.01 fM to 10 pM. Compared with the individual component-based aptasensors and other reported miRNA-155 aptasensors, the proposed impedimetric aptasensing system exhibited substantial merits of a feasible preparation process, non-use of labels or electrochemical indicators, fast response time, and comprehensive sensing performances for detecting miRNA-155. This strategy for determining miRNAs can extensively be applied as the platform for anchoring other kinds of aptamers in detecting diverse targets, thus indicating its great potential application for the early diagnosis of cancer biomarkers.
关键词： Impedimetric aptasensing,Iron phthalocyanine,Nanohybrid,Detection of miRNA-155,Ti3C2Tx MXene nanosheets,Electrochemical aptasensor
更新于2025-09-23 15:19:57
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Hydrothermal-assisted grinding route for WS2 quantum dots (QDs) from nanosheets with preferable tribological performance
摘要： The 2D nanomaterials have achieved the superlubrication property whatever in solid or liquid lubrication in recent years. However, whether or not the nanosheets can stably disperse in oils and smoothly enter into the asperity of friction pairs is crucial for exerting the function of antifriction. The structure of 2D QDs is desirable for addressing these issues due to its smaller 3D size. In this study, we developed a facile preparation process for WS2 QDs with uniform 2nm size from nanosheets via hydrothermal-assisted grinding approach. The structure of the as-obtained WS2 QDs was determined by a series of characterizations. The results showed that the as-obtained WS2 QDs exhibited the typical spectrum features of nanosized quantum dot. The results of the tribological performance in grease verified that the average grease, respectively, exhibiting a preferable friction reducing and wear resistance. friction coefficient (ACOFs) and wear volume (AWVs) were decreased by 7.89% and 63.90% relative to In this work, we successfully developed a facile exfoliation process for WS2 QDs from nanosheets via hydrothermal-assisted grinding approach. The as-obtained WS2 QDs were determined by a series of characterizations. The preparation mechanism of WS2 QDs was proposed. The tribological properties of the as-exfoliated WS2 QDs in grease were intensively evaluated by the reciprocating ball-on-disk mode.
关键词： WS2,Nanosheets,Tribological performance,Quantum dots,Grease
更新于2025-09-23 15:19:57
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Electrospray deposited MoS2 nanosheets as an electron transporting material for high efficiency and stable perovskite solar cells
摘要： For perovskite solar cells (PSCs), the development of low cost, stable and e?cient electron transport materials (ETMs) is of prime consideration. Here, we have introduced a scalable electrospraying technique for the direct deposition of hydrotermally synthesized two-dimensional (2D) MoS2 nanosheets ETMs, onto the ?uorine-doped tin oxide (FTO) glass susbtarte to use in PSCs with reduces hysteresis, improved ambient stability and high e?ciency. The PSCs fabricated with electrospray deposited MoS2 nanosheets demonstrate the maximum power conversion e?ciency (PCEmax) of 16.17%, that is comparable to the PCEs achieved from compact SnO2 and TiO2 ETM based PSCs. The current ?ndings present a new route for the construction of stable and e?cient PSCs based on a low-cost and solution- processed MoS2 nanosheets ETMs.
关键词： Thin ?lms,Electrospray,Perovskite solar cells,Hysteresis-free,MoS2 nanosheets
更新于2025-09-23 15:19:57
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Ultrathin two-dimensional conjugated metala??organic framework single-crystalline nanosheets enabled by surfactant-assisted synthesis
摘要： Two-dimensional conjugated metal-organic frameworks (2D c-MOFs) have recently emerged for potential applications in (opto-)electronics, chemiresistive sensing, and energy storage and conversion, due to their excellent electrical conductivity, abundant active sites, and intrinsic porous structures. However, developing ultrathin 2D c-MOF nanosheets (NSs) for facile solution-processing and integration into devices remains a great challenge, mostly due to unscalable synthesis, low yield, limited lateral size and low crystallinity. Here, we report a surfactant-assisted solution synthesis toward ultrathin 2D c-MOF NSs, including HHB-Cu (HHB=hexahydroxybenzene), HHB-Ni and HHTP-Cu (HHTP=2,3,6,7,10,11-hexahydroxytriphenylene). For the first time, we achieve single-crystalline HHB-Cu(Ni) NSs featured with a thickness of 4-5 nm (~8-10 layers) and a lateral size of 0.25-0.65 μm2, as well as single-crystalline HHTP-Cu NSs with a thickness of ~5.1±2.6 nm (~10 layers) and a lateral size of 0.002-0.02 μm2. Benefiting from the ultrathin feature, the synthetic NSs allow fast ion diffusion and high utilization of active sites. As a proof of concept, when serving as a cathode material for Li-ion storage, HHB-Cu NSs deliver a remarkable rate capability (charge within 3 min) and long-term cycling stability (90% capacity retention after 1000 cycles), superior to the corresponding bulk materials and other reported MOF cathodes.
关键词： Li-ion batteries,Two-dimensional conjugated metal-organic frameworks,electrochemical performance,surfactant-assisted synthesis,ultrathin nanosheets
更新于2025-09-23 15:19:57