- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Enhanced Electron Transport in Rutile TiO2 Nanowires via H2S-Assisted Incorporation of Dissolved Silicon for Solar-Driven Water Splitting
摘要： Si-doping is an effective approach to enhance the electron transport and the photocatalytic activity of photocatalyst. In this study, for the first time the silicate glass such as fluorine-doped tin oxide (FTO) glass substrate is used as the silicon source for preparing Si-doped TiO2 photoanodes. First, the rutile TiO2 nanowires (NWs) were grown on FTO glass substrates by hydrothermal reaction, accompanying with the gradual dissolution of glass to generate soluble Si dopant incorporated into TiO2 NWs. Second, the TiO2 NWs were reduced to form the Ti3+ by H2S reduction. Finally, the Si-doped TiO2 photoanodes with higher doping density was obtained by calcination. The visible photocatalytic activity of Si-doped TiO2 NWs photoanode towards water splitting increased about three times as compared with pure TiO2 NWs. Reduction by H2S resulted in the enhanced electron transport and massive increase in charge-carrier density. This work provides a novel paradigm for silicon doping in materials for accelerating their carrier transport and applications.
关键词： Charge transport,Titanium dioxide,Silicon doping,Hydrothermal reaction,Water splitting
更新于2025-09-10 09:29:36
-
Microwave assisted sol–gel synthesis of titanium dioxide using hydrochloric and acetic acid as catalysts
摘要： Titanium dioxide (TiO2) was synthesized by microwave assisted sol–gel. The effect of the acid type used as catalyst on the phase transformation of TiO2 was investigated (hydrochloric or acetic acid). The samples obtained were characterized by scanning electron microscopy (SEM), this micrographs showed particles with irregular shapes. The results of Fourier transform-infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) showed present signals of O and Ti. When hydrochloric acid was used as catalyst, three titania polymorphs were detected by X-ray diffraction (XRD), anatase, rutile and brookite, where the crystallite size was in the range of 9 and 16 nm. On the other hand, a single anatase phase was formed when acetic acid was used after only 15 min of reaction time. The anatase average crystallite size was obtained between 11 and 22 nm.
关键词： Microwave-assisted sol–gel,Acetic acid,Hydrochloric acid,Titanium dioxide
更新于2025-09-10 09:29:36
-
Synthesis and Photocatalytic Activity of Nanosized Powder of Zn-Doped Titanium Dioxide
摘要： Nanosized powder materials made Zn-doped titanium dioxide with concentration of 0.1, 0.5, and 1.0 mol % Zn2+ have been synthesized from aqueous solutions of inorganic compounds of titanium modified with zinc(II) ions. The materials obtained have been studied by electron microscopy, thermogravimetric analysis, and powder X-ray diffraction. It has been found that if zinc ions introduced in titanium dioxide the stabilization of anatase modification takes place retaining size and morphology of particles. The materials synthesized have shown photocatalytic activity under ultraviolet and visible light irradiation. The highest photocatalytic activity has been found for material containing 0.1 mol % Zn2+ and calcined at 600°С.
关键词： photocatalytic activity,nanoparticles,titanium dioxide,nanomaterials
更新于2025-09-10 09:29:36
-
A quantitative XPS examination of UV induced surface modification of TiO2 sorbents for the increased saturation capacity of sulfur heterocycles
摘要： UV pretreatment has proven effective in enhancing the sulfur heterocycle specificity and saturation capacity of TiO2 adsorbents. Previous efforts in our laboratory have shown this effect to persist for over two weeks and were attributed to increased densities of surface hydroxyl groups as assessed by XPS and FTIR evaluations. This paper presents further evidence of the previous assertion by tracking the UV-induced conversion of adsorbed water and lattice oxygen into surface hydroxyls as monitored by XPS. Two different commercial TiO2 adsorbents (@ 163 and 70 m2/g) were investigated at various hydration levels as determined by TGA. Deconvolution of the XPS spectra demonstrated both the qualitative nature and quantitative conversion of adsorbed water and lattice oxygen according to the following stoichiometry, where one lattice oxygen is converted into two surface hydroxyls. Eight different reaction cases were examined using the 163 and 70 m2/g supports at four different hydration levels each. The measured stoichiometry for the above-noted conversion varied from 1.83 to 2.15 with an average value of 1.98 and a standard deviation of 0.10. Samples removed from the XPS chamber and stored in laboratory conditions showed that photo-generated surface hydroxyls could persist for over two weeks with or without handling.
关键词： XPS,TGA,Hydroxyl group,Titanium dioxide,UV,Photo-assisted adsorptive desulfurization
更新于2025-09-10 09:29:36
-
[IEEE 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - Kiev (2018.4.24-2018.4.26)] 2018 IEEE 38th International Conference on Electronics and Nanotechnology (ELNANO) - ITO-Nano-Titania Gas Sensors at Adsorption of Ethanol, Acetone and Water Molecules
摘要： The measurements capacitance-voltage characteristics and capacitance kinetics were applied for investigation of physical principle of sensor response in the ITO – nanostructured titanium dioxide heterojunction. The studies were fulfilled for ethanol, acetone and water vapor under various frequencies of probing signal. It was shown that processes of surface states recharging are making the most significant contribution to the total capacitance of the studied heterojunction and playing a major role in forming of sensor response to the molecules of the used analytes.
关键词： titanium dioxide,surface states,adsorption,capacitance-voltage characteristics,capacitance kinetics,gas sensor,electronic traps,hysteresis
更新于2025-09-10 09:29:36
-
Ag/TiO <sub/>2</sub> NPs/TiO <sub/>2</sub> TF/Si Based Non-Volatile Memristor Device for Neuromorphic Computing Applications
摘要： Memristor device is a very promising emerging component for a revolution of the memory and computing applications in the recent years. It could be enhancing the field of artificial intelligence and helping the patients, suffering from various kinds of autism disorders, as well as in neuromorphic computing, neural networks, etc. This research article proposes fabricated non-volatile memristor device for neuromorphic computing applications. The demonstrate memory is based on Ag/TiO2 NPs/TiO2 TF/Si layers’ structure and achieves better conductivity and storage capacity, which could improve the performance of the neuromorphic computing as compared to conventional ones. The fabrication method of the proposed multi-layer memristor is examine with well precise techniques, which overcome the previous challenges. The surface morphology of the device is analysed by field emission gun scanning electron microscopy (FEGSEM) and Energy dispersive X-ray system. The rise time (Tr) of 2.5 s and fall time (Tf) of 3 s are demonstrated under ON/OFF white light illumination. While X-ray diffraction depicted that titanium dioxide nano particle, (TiO2 NPs) are crystalline in nature. Moreover, Photoluminescence and Raman analysis justify crystalline nature also and increasing oxygen vacancies concentration with the heating effect of TiO2 NPs. The electrical analysis reveals the driving mechanism under different sweeping voltages during SET and RESET resulting in low resistance state (‘ON’). Finally, capacitance-voltage characteristic of the proposed memory device shows excellent charge storage capacity within the dynamic range of operation.
关键词： Titanium Dioxide Nano Particles (TiO2 NPs),Memristor Devices,Neuromorphic Computing,Titanium Dioxide Thin Film (TiO2 TF)
更新于2025-09-09 09:28:46
-
Surface grafting modification of titanium dioxide by silane coupler KH570 and its influences on the application of blue light curing ink
摘要： A series of reactive TiO2 pigments with olefinic double-bonds were prepared by grafting modification of silane coupler KH570 to be covalently anchored in the blue-light curing film, which improved the color fastness to crocking of the printed fabrics significantly. Effects of KH570 concentrations on particle size, surface wettability and dispersing stability of KH570-TiO2 pigments, photo-polymerization of KH570-TiO2 bule-light curing inks and tensile properties of curing films were investigated. Color fastness to crocking of KH570-TiO2 pigment on cotton fabric was explored. Results showed that compared to the native TiO2, all the properties of KH570-TiO2 improved. With the increases of KH570 concentrations, the grafting degrees of KH570-TiO2 had gradual increase. The surface hydrophobicity and dispersion stability of KH570-TiO2 pigments, photo-polymerization of KH570-TiO2 blue-light curing ink and tensile properties of curing films enhanced, especially those of 12KH570-TiO2~20KH570-TiO2 the best. Within the concentrations of KH570 12～20 wt %, the printed fabrics had dry/wet color fastness to crocking no less than 4 grades.
关键词： printing ink,grafting,blue-light curing,Titanium dioxide,silane coupler
更新于2025-09-09 09:28:46
-
A review of inorganic UV filters zinc oxide (ZnO) and titanium dioxide (TiO <sub/>2</sub> )
摘要： Photoprotection has become integral in the prevention of keratinocyte cancer and photoaging. Organic UV filters such as oxybenzone and octinoxate have become controversial due to their potential impact on the environmental and their potential human health risks. As such, inorganic UV filters, ZnO and TiO2, have become paramount in discussions about photoprotection. ZnO and TiO2 are used in sunscreens as nanoparticles, which denotes a size less than 100nm. The smaller size of these mineral particles increases their cosmetic acceptability by users as they are much less visible after application. ZnO has a broad UVA-UVB absorption curve, while TiO2 provides better UVB protection. Overall, the human health risks with inorganic filters are extremely low given a lack of percutaneous absorption; however, there is potential risk when exposed via inhalation, prompting recommendations against spray sunscreen products with nanoparticles. At this time, the known risk to the environment is low though the risk stratification may evolve with increasing usage of these filters and higher environmental concentrations. The continued practice of photoprotection is critical. The public should be counseled to seek shade, use photoprotective clothing including hats and glasses in addition to sunscreens on sun-exposed skin. For those concerned about emerging evidence of environmental impact of organic UV filters, based on current evidence, ZnO and TiO2-containing sunscreens are safe alternatives.
关键词： environmental impact,titanium dioxide,photoprotection,inorganic UV filters,nanoparticles,zinc oxide,health risks,sunscreen
更新于2025-09-09 09:28:46
-
Enhanced Photocatalytic Activity of TiO <sub/>2</sub> Nanotubes with Acid Treatments
摘要： In this work, we present the enhanced photocatalytic activity of TiO2 nanotubes (TNTs) by hydrothermal method with acid treatment. Firstly, TNTs were synthesized by using a hydrothermal method from commercial TiO2 powder in a 10 M NaOH solution at 130 (cid:3)C for 22 hours. The synthesized solid product after synthesis was then treated by three different post washing procedures: (i) distilled water, (ii) 2 M HCl + distilled water, and (iii) 2 M HNO3 + distilled water. The morphology, structural, and chemical composition of the washed TNT nanostructures were characterized by using the transmission electron microscopy (TEM), X-ray diffraction (XRD), and energy-dispersive X-ray diffraction (EDX). The photocatalytic activities of TNTs were then evaluated through the photocatalytic degradation of the methylene blue (MB) solution. The results reveal that the post washing procedures affect the uniformity, Na impurity of the achieved TNTs and the reduction of Na impurity content, makes for ef?cient photocatalytic properties.
关键词： Photocatalytic,Titanium Dioxide Nanotubes,Hydrothermal Process,Washing
更新于2025-09-09 09:28:46
-
On independent resolving number of TiO 2 [m, n] nanotubes
摘要： Let G(V, E) be a Graph. A set W ? V of vertices resolves a graph G if every vertex of G is uniquely determined by its vector of distances to the vertices in W. The metric dimension of G is the minimum cardinality of a resolving set. By imposing different conditions on W we get conditional resolving sets. A resolving set W is said to be an independent resolving set if W contains isolated vertices. Independent resolving number denoted by ir(G) is referred to its cardinality. In this paper we investigate independent resolving number for Titanium dioxide Nanotube.
关键词： independent resolving number,Metric dimension,Titanium dioxide,Nanotube,independent resolving set,Nanostructure
更新于2025-09-09 09:28:46