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Effect of seed layer on growth of rutile TiO <sub/>2</sub> nanorods
摘要： For achieving the high quality of titanium dioxide (TiO2) nanorods, herein, we present a synthesis of rutile TiO2 nanorods on a transparent conductive fluorine-doped tin oxide (FTO) glass substratewith seed layer by a two-step method. TiO2 thin films were first precoated by spin coating and annealing, followed by the growth of TiO2 nanorods with a hydrothermal method. The crystallographic nanostructures and properties of the nanorods were investigated. XRD results demonstrate that seed layer was tetragonal anatase TiO2 structure while nanorods had tetragonal rutile TiO2 structure. Since the hydrothermal technique was conducted in medium acid, structure of nanorods was induced to form in rutile phase. The major characteristic orientation of nanorods on the seed layers was (002) and minor in (101) planes. FE-SEM results show that seed layer enhances the process to achieve vertical-aligned orientation of the TiO2 nanorods, which contribute to develop electron transport rate and could pay an important role inelectron transport layer in high-performance Perovskite solar cell.
关键词： seed layer,hydrothermal method,rutile TiO2 nanorods,Perovskite solar cell,electron transport layer
更新于2025-09-23 15:19:57
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Facile Synthesis and Characterization of Uniform PbS Nanorods
摘要： This work reports a facile solution route for the synthesis of uniform PbS nanorods in high yield by the reaction of lead acetate trihydrate (Pb(CH3COO)2·3H2O) and thioacetamide (TAA) with the assistance of surfactant cetyltrimethylammonium bromide (CTAB). The morphology, structure and optical properties of the products were characterized by means of X-ray powder diffraction (XRD), energy-dispersive X-ray spectrometry (EDX), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis-NIR absorption spectroscopy and photoluminescence (PL) spectroscopy. It was found that the nanorods have a diameter of 36 nm and a length of 110 nm and show good UV-Vis-NIR absorption and PL emission properties. Moreover, a possible growth mechanism of formation PbS nanorods was proposed.
关键词： Chemical Synthesis,Crystal Growth,PbS Nanorods,Nanostructured Materials
更新于2025-09-19 17:15:36
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Polydopamine coating decreases longitudinal plasmon of Au nanorods: Experiment and simulations
摘要： Polydopamine (PDA) coated Au nanorods (AuNRs) have attracted great interest as a convenient platform to construct various multifunctional nanoparticles for theranostic applications. Typically, the formation of a dielectric shell on the surface of plasmonic particles results in an increase in the particle extinction and in a small red shift of the plasmonic peak. However, compared to the well-known coatings such as silica, biopolymers, and polyelectrolytes, polydopamine is light absorbing material in the visual and NIR spectral range. In this paper, we demonstrate, for the first time, unusual changes in plasmonic properties of AuNRs after PDA coating. Namely, the longitudinal plasmon resonance decreases while the transversal one increases compared to the corresponding initial values of bare AuNRs. Remarkably, the increasing and red shifting of the transversal plasmon is similar to the common changes in plasmonic properties of PDA-coated spheres. To confirm the experimental observations, we simulated the extinction, absorption and scattering spectra for AuNRs with different geometrical properties and PDA shell thicknesses by using two literature models for the refractive index of PDA. The decreasing of plasmonic peak intensity became higher with an increase in the AuNR aspect ratio and the imaginary part of PDA refractive index. Our experimental results and simulations provide a new insight into understanding the optical properties of composite plasmonic particles.
关键词： Plasmon resonance,Refractive index,Au nanorods,Polydopamine
更新于2025-09-19 17:15:36
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Facile Coengineering of Oxygen Defects and Highly Active {110} Facets in TiO <sub/>2</sub> Nanorods for Efficient Water Splitting
摘要： Optimizing the photocatalytic activity of TiO2 for hydrogen evolution from water splitting remains a challenging task. Herein, we report the synthesis of a slightly oxygen-deficient TiO2 film consisting of anatase nanorods with mainly {110} lateral surfaces by a facile one-step technology of magnetron sputtering. The 1D nanostructure and Ti3+/oxygen vacancies in the as-prepared TiO2 film are advantageous for the inhibition of recombination of electron-hole pairs, while the exposed {110} lateral surfaces provide abundant surface active sites; as a result, this TiO2 exhibited an ultra-high photocatalytic activity for water splitting. Remarkably, photocatalytic overall water splitting into H2 and O2 simultaneously with a ratio close to 2:1 has been realized for the first time over pristine anatase TiO2 without the assistance of sacrificial electron donor and cocatalyst. Additionally, in the presence of methanol as a sacrificial agent, the pristine TiO2 displayed a high apparent quantum efficiency of ～21.4% at 365 nm and the hydrogen generation rate under the full-arc light irradiation could be as high as 14.35 mmol m-2 h-1, which is about three orders of magnitude higher than that of P25 film (~0.014 mmol m-2 h-1). This result provides a facile pathway to synthesizing defect-based metal oxide with optimal facets and morphology for high-efficiency energy conversion.
关键词： TiO2 nanorods,active facets,photocatalysis,oxygen defect,water splitting
更新于2025-09-19 17:15:36
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P-9.11: Synthesis and optical properties of CdSe <sub/>x</sub> S <sub/>1-x</sub> nanomaterials with different morphologies
摘要： The optical properties of colloidal nanometer quantum dots, including fluorescence peak position, fluorescence peak width, fluorescence quantum yield, fluorescence attenuation channel, fluorescence scintillation and brightness of single quantum dots, are determined by the properties of Exciton states, and the properties of Exciton states are closely related to their structure. During the synthesis of CdSexS1-x Nanomaterials, a series of different morphologies are obtained by controlling the reaction solvent, reaction temperature, reaction time, type and concentration of the reaction ligand and the precursor type CdSeXS1-x nanomaterial.
关键词： CdSe,Nanoplatelets,Nanorods,Quantum Dots
更新于2025-09-19 17:15:36
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Complex-surfactant-assisted hydrothermal synthesis of one-dimensional ZnO nanorods for high-performance ethanol gas sensor
摘要： One-dimensional (1D) ZnO nanorods (ZNRs) were synthesized by a facile and effective hydrothermal method using the mixture of sodium dodecyl sulfate (SDS) and polyethylene glycol 400 (PEG400) with a molar ratio of 1:1 as the complex surfactant. The microstructure and morphology were characterized using of X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The results demonstrated that the ZNRs are of a single crystal hexagonal wurtzite structure, having a larger length-to-diameter ratio with more regular surface morphology compared with the ZnO products obtained in the presence of only SDS or PEG400. A possible growth mechanism was proposed based the mediation reaction of the complex surfactant. Gas sensing measurements indicated that the ZNRs assisted by the complex surfactant demonstrated excellent ethanol sensing properties at an optimal operating temperature of 300 °C, which could be ascribed to their large length-to-diameter ratio, one-dimensional structure, and numerous surface defects of oxygen vacancies.
关键词： Zinc oxide,Gas sensor,Ethanol,Nanorods,Complex surfactant
更新于2025-09-19 17:15:36
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Green-amber emission from high indium content InGaN quantum wells improved by interface modification of semipolar (112?2) GaN templates
摘要： The Na-ion hybrid capacitor (NIC) has exhibited its potential applications for devices that need high energy and power densities with low cost. Nevertheless, due to their 'Daniell-type' mechanism, conventional NIC devices require massive electrolytes to provide a good ionic conductivity during charging, which could decrease the packaged energy density. Herein, we report a novel 'Rocking-Chair' Na-ion hybrid capacitor (RC-NIC) employing Na-ions as charge carriers, Na3V2O2(PO4)2F@PEDOT as the cathode material and activated carbon (AC) as the anode material. RC-NIC efficiently improves the energy density by minimizing the amount of electrolyte like secondary batteries because Na-ion is de-intercalated from the cathode while it is adsorbed to the anode during charging. The Na3V2O2(PO4)2F@PEDOT//AC (peanut shell derived carbon) RC-NIC delivers high energy density of 158 W h kg?1 and power density of 7000 W kg?1 based on the total mass of active materials in both electrodes, respectively, in the voltage window of 1.0–4.2 V. This is one of the highest energy densities among the previously reported NICs. This concept provides a new route to build sodium-ion hybrid capacitors that meet dual criteria of battery and supercapacitor characters.
关键词： Na-ion hybrid capacitor,core–shell nanorods,energy storage,Na3V2O2(PO4)2F@PEDOT,rocking-chair mechanism
更新于2025-09-19 17:15:36
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Protein-functionalized WO3 nanorods–based impedimetric platform for sensitive and label-free detection of a cardiac biomarker
摘要： We report the development of a sensitive and a label-free electrochemical immunosensing platform for the detection of cardiac biomarker troponin I (cTnI) using tungsten trioxide nanorods (WO3 NRs). The low-temperature hydrothermal technique was employed for the controlled synthesis of WO3 NRs. Thin films of 3-aminopropyltriethoxy saline (APTES)-functionalized WO3 NRs were deposited on indium tin oxide (ITO)-coated glass substrate (0.5 cm × 1 cm) using electrophoretic deposition technique. The covalent immobilization of cTnI antibody onto functionalized WO3 NRs electrode was accomplished using EDC-NHS [1-(3-(dimethylamino)-propyl)-3-ethylcarbodiimide hydrochloride and N-hydroxysulfosuccinimide] chemistry. The structural and morphological characterizations of WO3 NRs and functionalized WO3 NRs were studied using X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and electrochemical techniques. The impedimetric response study of the proposed immunosensor demonstrates high sensitivity [6.81 KΩ·mL/(ng·cm2)] in a linear detection range of 0.01–10 ng/mL. The excellent selectivity, good reproducibility, and long-term stability of the proposed immunosensing platform indicate WO3 NRs as a suitable platform for the development of a point-of-care biosensing device for cardiac detection.
关键词： electrochemical impedance spectroscopy,tungsten trioxide nanorods,immunosensor,cardiac biomarker,label-free detection
更新于2025-09-19 17:15:36
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Rectifying Behaviour and Photocatalytic Activity in ZnO Nanorods Array/Ag/CuSe Heterostructure
摘要： Ag incorporated vertically aligned ZnO nanorods array/CuSe thin film (ZnO NRs/CuSe TF) have been fabricated via a solution route, thermal evaporation and magnetron sputtering process. Ternary ZnO nanorods/Ag/CuSe heterostructure was studied by X-ray diffractometry, field emission-scanning electron microscopy/energy dispersive X ray spectroscopy, current–voltage measurement and a UV–Vis–near IR spectrophotometer. The photocatalytic performance was estimated by the degradation of Rhodamine B solution under UV–Vis light irradiation. The photocatalytic efficiency of the ZnO NRs/Ag/CuSe heterostructure is higher than that of ZnO NRs/Ag and ZnO NRs/CuSe counterparts due to the robust effects of the three functional components coupling. The localized surface plasmon resonance and two Schottky junctions (e.g. Ag/ZnO and Ag/CuSe) motivates photogenerated electron–hole separation and transfer. This work presents an artificial manipulated system to enhance light harvesting, efficient charge separation and transfer, and low recombination rate in solar energy conversion.
关键词： Photocatalytic activity,Localized surface plasmon resonance (LSPR),Charge separation,ZnO nanorods array/Ag/CuSe heterostructure
更新于2025-09-19 17:15:36
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Electro-optical switching in twisted nematic samples doped with gold nanorods
摘要： The present study is devoted to the investigation of reorientation properties of 8CB liquid crystal samples doped with gold nanorods with distinct aspect ratios. By using an optical experimental setup to probe the electro-optic response of twist cells under an AC electric field, we measure the characteristic switch times and Freedericksz threshold of doped nematic liquid crystals. The effects associated with the surface plasmon resonance and disorder induced by the metallic guest particles are analyzed. Further, we exploit the Gooch-Tarry conditions and Mauguin minima to account the thermal dependence of nematic birefringence in pristine and doped samples. Our results show that the electro-optical and thermal parameters of twisted nematic cells are strongly affected by the addition of gold nanorods.
关键词： Nematic liquid crystals,Gold nanorods,Reorientation
更新于2025-09-19 17:13:59