- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
AIP Conference Proceedings [Author(s) 4TH ELECTRONIC AND GREEN MATERIALS INTERNATIONAL CONFERENCE 2018 (EGM 2018) - Bandung, Indonesia (27–28 July 2018)] - Effects of Ag dopant and ultraviolet irradiation on structural properties of zinc oxide nanostructures
摘要： ZnO nanorods are promising UV light driven photocatalyst for the degradation of organic dyes. In this work, the effects of Ag dopant (0.02 to 0.1 mol%) and ultraviolet irradiation (0 to 6 min) on structural, optical and photocatalytic properties of zinc oxide nanorods were investigate. The Ag incorporation ZnO nanoraod have been grown on glass substrate by chemical solution deposition method. The films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV–vis absorption spectroscopy (UV–vis). The XRD spectra of the Ag incorporation ZnO (Ag-ZnO) films indicate that Ag was incorporated in the wurtzite hexagonal crystal structure of ZnO and the crystallinity were enhanced with increasing of Ag amount as well as ultraviolet irradiation time. SEM micrographs of pure ZnO films revealed the uniform distribution of rod-like nanostructure of size of about 30-40 nm. Increasing Ag amount as well as irradiation time stimulated the optical properties of ZnO nanostructures. The photocatalytic activity of these nanostructures was evaluated by analysing UV irradiation degradation of methyl orange (MO) dye and it was observed that Ag-ZnO show significantly enhanced photocatalytic activity for degradation of MO, as compared to ZnO nanorods.
关键词： structural properties,ZnO nanorods,ultraviolet irradiation,Ag dopant,photocatalytic activity
更新于2025-09-04 15:30:14
-
Direct formation of gold nanorods on surfaces using polymer-immobilised gold seeds
摘要： Herein, we present the formation of gold nanorods (GNRs) on novel gold–poly(methyl methacrylate) (Au–PMMA) nanocomposite substrates with unprecedented growth control through the polymer molecular weight (Mw) and gold-salt-to-polymer weight ratio. For the first time, GNRs have been produced by seed-mediated direct growth on surfaces that were pre-coated with polymer-immobilised gold seeds. A Au–PMMA nanocomposite formed by UV photoreduction has been used as the gold seed. The influence of polymer Mw and gold concentration on the formation of GNRs has been investigated and discussed. The polymer nanocomposite formed with a lower Mw PMMA and 20 wt % gold salt provides a suitable medium for growing well-dispersed GNRs. In this sample, the average dimension of produced GNRs is 200 nm in length with aspect ratios up to 10 and a distribution of GNRs to nanoparticles of nearly 22%. Suitable characterization techniques such as AFM and SEM have been used to support concept of the proposed growth method.
关键词： direct surface growth,gold nanorods,nanocomposites,atomic force microscopy (AFM),poly(methyl methacrylate) (PMMA)
更新于2025-09-04 15:30:14
-
Diameter dependent transparency changes of nanorod-based large-area flexible smart window devices
摘要： Saving energy and designing an environmentally friendly atmosphere in modern buildings will require smart windows that can adapt to a variety of conditions and requirements, such as weather, human load and personal desire. The key element of such windows is the material system that transmits light in and out of the building in a controlled manner. To address the need for such a system, here we report the fabrication of novel, flexible, large-area devices that are based on suspended organometallic nanorods. As a result of the detailed characterization and extensive optimization of nanorod synthesis and device fabrication, our fabricated devices achieve superior optical and stability performances, with optical modulation as high as 73.7% (the highest value reported to date) and bending capability up to 180 degrees without any structural damage. This performance is further reinforced by repeated switching testing between high (“on”) and low (“off”) optical transmittance states over 500 cycles. Finally, we are able to scale up the fabrication of such devices to large areas (24 cm by 9 cm, size limited by our laboratory-scale doctor blade), underlining the possibility of adopting the results reported herein for future flexible smart windows and electronics. An interesting finding that the eventual SPD performance is indeed largely dependent on the diameter of the nanorods instead of their aspect ratios provides useful guidelines for future development.
关键词： flexible devices,energy saving,optical modulation,organometallic nanorods,smart windows
更新于2025-09-04 15:30:14
-
Controllable synthesis of transparent dispersions of monodisperse anatase-TiO2 nanoparticles and nanorods
摘要： Controllable synthesis of monodisperse nanocrystals is still a great challenge. In this study, the control strategy of alcohol medium was developed to conveniently synthesize monodisperse anatase-TiO2 nanocrystals with controllable size and shape by sol-gel method combined with solvothermal treatment. The effects of the amount of stearic acid and water, and molecular structure of alcohol on the size, the shape and the dispersity of TiO2 nanocrystals were explored. The optimum synthesis conditions were achieved. Monodisperse TiO2 nanoparticles and nanorods were obtained by using linear and branched alcohols, respectively. The size of nanoparticles decreased from 12 to 5 nm with increasing carbon number of linear alcohol. The aspect ratio of nanorods was adjusted from 1 to 5 by selecting alcohols with different locations of branched methyl group. The as-prepared monodisperse TiO2 nanocrystals could be readily dispersed in some commonly-used solvents to form transparent nanodispersions. Furthermore, a possible formation mechanism was also investigated.
关键词： Monodisperse TiO2 nanocrystals,transparent dispersion,nanoparticles,nanorods,tunable preparation
更新于2025-09-04 15:30:14
-
Pressure-Induced Phase Transitions in TiO <sub/>2</sub> Rutile Nanorods
摘要： TiO2 nanorods (diameter of 6-8 nm) with the rutile-type structure have been investigated by Raman spectroscopy under high pressure. Additional bands in the Raman spectrum at ambient pressure are interpreted as resulting from defects that break the Raman selection rules as the simulated vibrational density of states (vDOS) is in good agreement with the experimental spectrum. Under pressure, the rutile structure transforms to the baddeleyite one at P~16 GPa. After pressure cycle, the α-PbO2 phase is recovered. The sequence of phase is discussed in terms of thermodynamics and kinetics based on crystallographic relationships. Contrary to other 1D TiO2 nanomaterials that adopt a metastable structure, the nanorods studied in this work show little impact of the morphology on the phase transitions sequence compared to the bulk TiO2.
关键词： phase transitions,vibrational density of states,TiO2 nanorods,high pressure,Raman spectroscopy
更新于2025-09-04 15:30:14
-
[IEEE 2018 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO) - Hangzhou, China (2018.8.13-2018.8.17)] 2018 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO) - Precisely Lateral Alignment of Gold Nanorods Array via Hydrophilic-Hydrophobic Pattern
摘要： A simple strategy which combines the controlled solvent evaporation and hydrophilic-hydrophobic pattern to allow assembling gold nanorods (GNRs) on a flat substrate with arbitrary shapes in this work. Soft polydimethylsiloxane (PDMS) template as a pattern transfer stamp were utilized and transferred the structures onto the substrate successfully. By tuning the structures and sizes of templates, oriented large area lateral aligned GNRs arrays were fabricated as expected. Scan electron microscopy (SEM) images revealed that GNRs had been precisely placed as expected and the assembly is uniform.
关键词： hydrophilic-hydrophobic pattern,gold nanorods,self-assembly,solvent evaporation,micro-array
更新于2025-09-04 15:30:14
-
[IEEE 2018 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - Saint Petersburg, Russia (2018.10.22-2018.10.23)] 2018 IEEE International Conference on Electrical Engineering and Photonics (EExPolytech) - Study of Gas-Sensitive Properties of Zinc Oxide Nanorod Array at Room Temperature
摘要： In this paper, we present a technique for the synthesis of zinc oxide nanorods and the study of their sensitivity to organic solvent vapors. Zinc oxide nanorods were synthesized by hydrothermal method. Investigation of gas-sensitive properties was carried out by the method of impedance spectroscopy. Studies of gas-sensitive properties of zinc oxide showed a significant response of the system to the vapor of reducing gases at room temperature. It is shown that the thickness of the seed layer and, correspondingly, the density of the structure on the basis of ZnO nanorods, strongly affect the sensitivity of the sensor.
关键词： impedance spectroscopy,nanorods,hydrothermal synthesis,zinc oxide,gas sensors
更新于2025-09-04 15:30:14
-
Low-Cost Integrated Zinc Oxide Nanorods Based Humidity Sensors for Arduino Platform
摘要： Realization of a simple integrated and low-cost intensity modulation/direct detection (IM/DD) based humidity and vapor detection system utilizing zinc oxide (ZnO) nanorods as the active material is demonstrated. The sensing device comprises of ZnO nanorods optimally grown on a glass substrate and mounted on 3D printed platform for the alignment with a green light-emitting diode (LED) set-up for edge excitation. An Arduino platform was used for signal processing of the detection of the transmitted light. Both forward and backward scattering are affected due to light leakage while propagating through the glass substrate that are further attenuated in the presence of humidity. In this work, backward scattering was found to be dominant and thus with increasing humidity a reduction in the transmitted light was monitored. When the sensor was tested in a humidity controlled environment, it was found that the output voltage drops by approximately 750 mV upon changing the relative humidity (RH) level from 35% to 90% in a non-linear fashion. The average sensitivity of the sensor was observed to be -12 mV/% throughout the tested RH levels. Sensitivity was found to be higher at -24.6 mV/% for RH’s beyond 70%. An average response time of 3.8 s was obtained for RH levels of 85% with respect to the standard ambient humidity conditions (RH 50%), which showed a quicker recovery time of 2.2 s. The proposed sensor device provides numerous advantages including low cost production, simplicity in design, ease of use and stability during handling.
关键词： light scattering,humidity sensor,nanorods,fast sensing,zinc oxide,arduino
更新于2025-09-04 15:30:14