Synthesis of Nanoporous TiO2 with the Use of Diluted Hydrogen Peroxide Solution and Its Application in Gas Sensing

Abstract

The chemical routes of metal oxidation in presence of hydrogen peroxide solutions are tailor-made for the synthesis of biocompatible metal oxide surfaces with clean intermediate and end products, such as oxides, hydroxides, hydrogen and water. The hydrolysis of titanium in hydrogen peroxide solutions is particularly interesting for medical applications, forming micro- and nanoscale titania surfaces. In this paper, the content of the hydrolysis solution is revised, allowing the fabrication of gas sensor devices based on nanoporous titania. Nanopore and microcrack formations were discussed in detail by monitoring the structural changes on the thin film surface with field-emission scanning electron microscopy (FE-SEM). A stable rutile crystalline phase was detected by glancing incidence X-ray diffraction (GI-XRD) measurement after repetitive hydrothermal processes. Electrical conductance measurements were carried out at high temperatures (400–600 °C) under humid airflow (40% RH@20 °C) with the injection of various concentrations of a wide set of test compounds (C2H3N, CO, H2, NO2, C2H6O), to observe the sensing capabilities of the material. Furthermore, the humidity effects on the sensing properties toward H2, CO, and C2H6O have been discussed.

Reactivity and Corrosion Behaviors of Ti6Al4V Alloy Implant Biomaterial under Metabolic Perturbation Conditions in Physiological Solutions

“…This behavior was observed by other authors and could be explained by the formation of a layer of a thin film of TiO 2 , because it is known that hydrogen peroxide is a strong oxidizing compound [ 14 , 25 , 32 , 33 , 34 ]. The addition of hydrogen peroxide promotes the growth of TiO 2 on the surface of an alloy biomaterial, but it can also have the effect of dissolving the oxide formed on the surface of the material following exposure to oxygen, as expressed by the possible reactions previously considered by some authors [ 35 , 36 ]: …”

“…For the analysis of electrochemical systems, the electrochemical impedance spectroscopy method can provide a wide range of information about the kinetics of the processes that take place at the electrode–electrolyte interface; thus, this method is used in the study of corrosion processes [ 36 ], to characterize semiconductors [ 37 ], in the study of batteries [ 38 ], and in the study of the kinetics of electrochemical deposition [ 39 ] or electrocatalysis [ 40 ] processes.…”

Cr2O3–TiO2-Modified Filter Paper-Based Portable Nanosensors for Optical and Colorimetric Detection of Hydrogen Peroxide

“…Literature study has revealed a variety of advantages of nanomaterial-based peroxidase mimetics as they are not only easy and simple to synthesize but also efficient in working due to their tunable catalytic activity along with low cost and high stability. , Nanostructured titania (nTiO 2 ) is receiving enormous attention owing to its important applications in photocatalysis for environmental cleanup, solar cells, clean H 2 energy production, antimicrobial activity, food processing, and in glucose as well as gas sensing. , Also, TiO 2 nanoparticles are preferably chosen for the synthesis of nanocomposites as they act as an efficient synergizing modulator for mimicking peroxidase activity and lower toxicity . However, TiO 2 exhibits a large energy band gap of 3.2 eV and a lower photocatalytic activity when the recombination of charge carriers occurs. , These properties somehow limit its electron-transfer ability.…”

“…18,19 Nanostructured titania (nTiO 2 ) is receiving enormous attention owing to its important applications in photocatalysis for environmental cleanup, solar cells, clean H 2 energy production, antimicrobial activity, food processing, and in glucose as well as gas sensing. 20,21 Also, TiO 2 nanoparticles are preferably chosen for the synthesis of nanocomposites as they act as an efficient synergizing modulator for mimicking peroxidase activity and lower toxicity. 22 However, TiO 2 exhibits a large energy band gap of 3.2 eV 23 and a lower photocatalytic activity when the recombination of charge carriers occurs.…”

Au Doping ZnO Nanosheets Sensing Properties of Ethanol Gas Prepared on MEMS Device

“…Most research studies consider metal oxides semiconductors as the sensing materials for developing gas sensors. There are different kinds of metal oxides for gas detections like ZnO [7], SnO 2 [8], In 2 O 3 [9], Fe 2 O 3 [10], and TiO 2 [11]. Among these metal oxides, ZnO thin films are considered mostly for developing the gas sensor [12,13].…”