- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Effect of hydrogen peroxide on photoelectric properties of high-transmittance FTO films prepared by spray pyrolysis
摘要： The FTO film prepared by spray pyrolysis has low efficiency and most of the precursors are discharged in the form of waste steam. According to the high oxidation property of H2O2, it is attempted to improve the film formation rate by changing the concentration of H2O2. Fluorine-doped SnO2 (FTO) thin films with high transmittance were prepared by spray pyrolysis using monobutyltin trichloride as the tin source and ammonium fluoride as the fluorine source. Different concentrations of hydrogen peroxide (0-0.08M) are added to the precursor solution. In this paper, we studied the effect of hydrogen peroxide on the structure, surface morphology and photoelectric properties of FTO thin films. The results show that the growth rate of the FTO films increased from 6.04 nm/s to 8.36 nm/s with the increase of H2O2 concentration from 0 to 0.08 M. The optimum preparation process is H2O2 concentration controlled at 0.04M, and FTO thin films suitable for solar cells are prepared. It has excellent performance parameters; carrier concentration:2.74*1021cm-3; carrier mobility:55.92 cm2 V-1s-1; photoelectric quality factor:2.66×10-3·Ω-1and the average transmittance of visible light: 79.87%. At the same time, increasing H2O2 concentration leads to narrowing of optical band gap. Adding appropriate hydrogen peroxide concentration can improve the film production rate and obtain excellent quality films.
关键词： Tin oxide,Preferred orientation,Hydrogen Peroxide,Optoelectronic performance
更新于2025-09-23 15:22:29
-
Steady-state Electrochemiluminescence at Single Semiconductive Titanium Dioxide Nanoparticles for Local Sensing of Single Cells
摘要： Obtaining steady-state bright electrochemiluminescence (ECL) at single nanoparticles is crucial but challenging for the realization of the single-nanoparticle electrochemical sensing of single cells. In this work, steady-state bright ECL is implemented at single semiconductive titanium dioxide (TiO2) nanoparticles for sensing the local efflux from single living cells. Oxygen vacancies on the surface of rutile TiO2 nanoparticles have a high affinity for hydrogen peroxides that are not easily passivated upon exposure to voltage. Therefore, the steady-state adsorption of hydrogen peroxide by the TiO2 nanoparticle surface permits the continuous electrochemical generation of superoxide and hydroxyl radicals by electrons and surface-trapped holes at the nanoparticles, resulting in constant ECL under physiological conditions. This steady-state luminescence during continuous imaging is correlated with the concentration of hydrogen peroxide, leading to the local ECL visualization of hydrogen peroxide efflux from single cells. The successful local ECL imaging demonstrated herein provides an unprecedented approach to enable subcellular electroanalysis using single nanoparticles.
关键词： electrochemiluminescence,titanium dioxide,single cells,hydrogen peroxide,single nanoparticles
更新于2025-09-23 15:21:21
-
Prussian Blue Nanocubesa??SnO <sub/>2</sub> Quantum Dotsa??Reduced Graphene Oxide Ternary Nanocomposite: An Efficient Nona??noblea??metal Electrocatalyst for Nona??enzymatic Detection of H <sub/>2</sub> O <sub/>2</sub>
摘要： Developing non-noble-metal electrocatalyst for non-enzymatic H2O2 sensing is highly attractive. A facile, two-step approach has been utilized for the synthesis of PBNCs/SnO2 QDs/RGO ternary nanocomposite. TEM, SEM, XPS, and XRD techniques were used to the characterize the structural and morphological properties of synthesized ternary nanocomposite. The synthesized ternary nanocomposite has been examined as an electrode material for the electrochemical detection of H2O2 using the Amperometry technique. Under optimum conditions, PBNCs/SnO2 QDs/RGO ternary nanocomposite performed very well in the electrocatalytic reduction of H2O2 with a linear dynamic range from 25-225 μM (R2 = 0.996) with a low detection limit of 71 nM (S/N=3). Compared to the recent literature, PBNCs/SnO2QDs/RGO ternary nanocomposite based modified electrode exhibit a wider linear dynamic range with a low detection limit. Furthermore, PBNCs/SnO2 QDs/RGO ternary nanocomposite based modified electrode showed an excellent anti-interference ability against various common interfering agents. The practical applicability of ternary nanocomposite based modified electrode was further extended to determine the H2O2 in tap water with acceptable recovery. The present performance of PBNCs/SnO2 QDs/RGO ternary nanocomposite material towards H2O2 sensing might widen its application for developing a new type of non-noble metal-based non-enzymatic electrochemical biosensors.
关键词： Hydrogen peroxide,Graphene,Non-enzymatic sensor,SnO2 quantum dots,Non-noble-metal electrocatalyst,Prussian blue nanocubes
更新于2025-09-23 15:21:01
-
HCN emission by a Polydesmid Millipede Detected Remotely by Reactive Adsorption on Gold Nanoparticles Followed by Laser Desorption/Ionization Mass Spectrometry (LDI-MS)
摘要： Hydrocyanic acid (HCN) is a well-known defensive allomone in the chemical arsenal of millipedes in the order Polydesmida. The presence of HCN in the headspace vapor of adult Xystocheir dissecta (Wood, 1867), a common millipede from the San Francisco Bay Area, was traced by laser desorption/ionization-mass spectrometry (LDI-MS). To accomplish this, the headspace vapor surrounding caged, live millipedes was allowed to diffuse passively over gold-nanoparticle (AuNP) deposits placed at various distances from the emitting source. The stainless steel plates with AuNP deposits were removed and irradiated by a 355-nm laser. The gaseous ions generated in this way were detected by time-of-flight mass spectrometry. The intensity of the mass spectrometric peak detected at m/z 249 for the Au(CN)2? complex anion was compared to that of the residual Au? signal (m/z 197). Using this procedure, HCN vapors produced by the live millipedes could be detected up to 50 cm away from the source. Furthermore, the addition of H2O2, as an internal oxygen source for the gold cyanidation reaction that takes place in the AuNP deposits, significantly increased the detection sensitivity. Using the modified H2O2 addition procedure, HCN could now be detected at 80 cm from the source. Moreover, we found a decreasing intensity ratio of the Au(CN)2?/Au? signals as the distance from the emitting source increased, following an exponential-decay distribution as predicted by Fick’s law of diffusion.
关键词： Gold nanoparticles (AuNP),Polydesmida,Laser desorption/ionization (LDI),Millipedes,Hydrogen cyanide (HCN),Hydrogen peroxide (H2O2),Allomones
更新于2025-09-23 15:19:57
-
Effectiveness of Different Laser-Assisted In-Office Bleaching Techniques: 1-Year Follow-Up
摘要： Objective: The aim of this study was to evaluate color longevity after different bleaching techniques. Background: Laser-activated bleaching methods are gaining popularity due to decreased chair time and increased patient compliance. However, the longevity of such methods has not been stated clearly. Methods: Sixty patients were divided into the following three groups (n = 20); group 1: chemical bleaching with 35% hydrogen peroxide (HP) gel, group 2: bleaching with 35% HP gel with diode laser activation, and group 3: bleaching with 35% HP gel with Er,Cr:YSGG laser activation. Color changes (DE*) were calculated by using two different formulas: (i) CIELAB (DEab) and (ii) CIEDE2000 (DE00) with a spectrophotometer before treatment, 24 h after treatment 3, 6, and 12 months after treatment. Evaluation of postoperative sensitivity was performed before and immediately after treatment, followed by re-evaluation 24 h and 1 week after treatment. Results: For DEab calculation, no significant difference was observed during both intra- and inter-group evaluations ( p > 0.05). For DE00 calculation, no significant intergroup difference was observed ( p > 0.05), whereas significant intragroup differences between the values of after treatment, 6–12 months. In the chemical bleaching group, increased postoperative sensitivity was observed after 24 h ( p < 0.001). In the diode-laser-activated group, postoperative hypersensitivity was detected at 24 h and 1 week. No significant hypersensitivity was observed in the Er,Cr:YSGG-laser-activated group ( p > 0.05). Conclusions: All three techniques provided efficient bleaching. Chemical and diode-activated bleaching methods resulted in slight sensitivity after application, whereas Er,Cr:YSGG-laser-activated bleaching did not cause sensitivity.
关键词： diode laser,laser-assisted bleaching,Er,Cr:YSGG laser,hydrogen peroxide
更新于2025-09-23 15:19:57
-
A Hydrogen Peroxide Sensor Based on Catalytically Active Systems Rua??RuO2 Obtained by High-Speed Laser Synthesis
摘要： There is a need for simple and economical chemical sensors for monitoring the concentration of hydrogen peroxide in biological media. In this work, we demonstrate the possibility of using for this purpose catalytically active ruthenium compounds obtained by high-speed laser synthesis on the surface of a graphite electrode.
关键词： Ru–RuO2,graphite electrode,catalytically active systems,hydrogen peroxide sensor,high-speed laser synthesis
更新于2025-09-23 15:19:57
-
Removal of humic acid from <b>aqueous solutions</b> using ultraviolet irradiation coupled with hydrogen peroxide and zinc oxide nanoparticles
摘要： In this study, individual performance of ultraviolet irradiation (UV), zinc oxide nanoparticles (ZnO) and hydrogen peroxide (H2O2) processes, as well as a performance of combined processes of UV/H2O2 and UV/H2O2/ZnO, were assessed for the removal of humic acid (HA) from aqueous solutions. Various process-related factors, such as the concentration of ZnO (0.2 and 0.5 g/L), the concentration of H2O2 (20, 30 and 50 mg/L), UV = 125 W, pH (4, 7 and 10), initial HA concentrations (at wavelength of 254 nm) of 2, 5, 7 and 10 mg/L, and three types of interferences (nitrate, sulphate and chloride) were studied and optimised. The results showed that removal e?ciency decreased by increasing the concentration of HA and pH values in all processes, but it increased by increasing the time of exposure and the concentration of H2O2. In the combined process of UV/ZnO/H2O2, the nanoparticle concentration of 0.2 g/L yielded the highest e?ciency, whereas in the other processes, the highest e?ciency was observed at nanoparticle concentration of 0.5 g/L. Based on these results, under the optimum conditions (HA = 2 mg/L, H2O2 = 50 mg/L, ZnO = 0.2 g/L, pH = 4.0 and contact time of 15 min), UV/ZnO/H2O2 process was found as the most e?cient combination in removing of HA with an e?ciency of 99.99%. Furthermore, the modelling results indicated that the adsorption reaction of HA onto ZnO nanoparticles was very well described by the pseudo-second-order kinetic model (R2 > 0.99).
关键词： hydrogen peroxide,Ultraviolet irradiation,zinc oxide nanoparticles,humic acid
更新于2025-09-23 15:19:57
-
Influence of low-level laser therapy on inflammation, collagen fiber maturation, and tertiary dentin deposition in the pulp of bleached teeth
摘要： Objectives We evaluated the effects of low-level laser therapy (LLLT) using an infrared laser (IRL) and a red laser (RL) on the pulp of molar teeth in rats after dental bleaching to assess inflammation, collagen fiber maturation, and tertiary dentin formation. Materials and methods Eighty Wistar rats (Rattus norvegicus, albinus) were randomly divided into eight groups with 10 hemimaxillae in each of the following: control; bleached (Ble, 35% hydrogen peroxide [H2O2]); Ble-1IRL and Ble-1RL (one IRL [808 nm, 30 s, 3 J] or RL [660 nm, 15 s, 1.5 J] application immediately after H2O2); Ble-3IRL and Ble-3RL (three [immediately, 24 h, and 48 h] IRL or RL applications after H2O2); and 3IRL and 3RL (three IRL or RL applications without bleaching). The rats were euthanized after 2 and 30 days for histological evaluation of inflammation (hematoxylin-eosin) and maturation of collagen fibers (picrosirius red). Additionally, the dentin deposition in the specimens obtained at 30 days was quantified via microtomography of the pulp chamber volume. Statistical analyses were performed (P < 0.05). Results Initially, severe damages to the pulp were observed in the Ble and Ble-1RL groups. Ble-1IRL and Ble-3RL groups showed lower inflammation. The bleached groups had a greater amount of mature collagen fibers than the control group. The Ble-3IRL group had a greater number of immature fibers than the Ble group. At 30 days, there was an absence of inflammation and equal proportion of mature and immature collagen fibers. All bleached groups showed a reduction in the volume of the pulp chamber. Conclusion Three consecutive applications of RL and one IRL application can minimize damage to the pulp of bleached teeth, whereas three IRL applications can minimize pulp fibrosis. However, LLLT did not prevent deposition of tertiary dentin. Clinical relevance This study describes LLLT protocols capable of minimizing inflammation and maturation of collagen fibers in pulp tissue after dental bleaching. However, the protocols proved insufficient for reducing the formation of tertiary dentin in bleached teeth.
关键词： Hydrogen peroxide,Dental bleaching,Dental pulp,Low-level laser therapy,Tertiary dentin
更新于2025-09-23 15:19:57
-
Removal of Textile Dye from Aqueous Media Using an Advanced Oxidation Process with UV/H <sub/>2</sub> O <sub/>2</sub>
摘要： This study investigated the treatment of water contaminated with textile dye (Cibacron Red FN-R, reactive red 238) using a UV/H2O2 process. The reaction was influenced by the input concentration of hydrogen peroxide H2O2, pH, temperature, and the concentration of textile dye in the wastewater. Analysis of the experimental results displayed both first order and the second order reactions. The reaction type was found to be of a first order throughout the systems. The removal efficiency of the UV/ H2O2 process at optimal conditions and dosage (H2O2 = 25 mg/L, pH=3, temperature =20 ?C for 50 mg/L dye concentration) were found to be 80.633% , 97.07%, and 99.43% at 60 min, 120 min, and 180 min, respectively with K1 = 0.0293 min-1 and R2=0.9992%. COD removal was also studied for the UV/H2O2 process and found to be 62.5%.
关键词： Hydrogen peroxide,Ozonation process,Destruction of organic and inorganic contaminants,Advanced Oxidation Processes (AOPs),Fenton process,adsorption,coagulation
更新于2025-09-19 17:15:36
-
Ultrapurewater for Cleaning Wafers in Semiconductor Manufacturing; 半導体洗浄のための超純水;
摘要： Ultrapurewater is essentially used in wet processes of semiconductor manufacturing in order to rinse out impurities on wafers and to prepare chemical solutions for wafer cleaning. The quality requirement for the ultrapurewater is getting higher along with the advance of semiconductor devices. The quality load map with analytical control items, puri?cation facilities and production system of the ultrapurewater are overviewed. The achievements in the technologies of reducing a trace amount of ?ne particles and metal impurities, which would particularly cause yield reductions by the wafer contaminations, are described. In addition, the recent works on hydrogen peroxide in the ultrapurewater is described as well.
关键词： metal,ultrapurewater,water quality analysis,particle,hydrogen peroxide
更新于2025-09-19 17:15:36