Hydrothermal synthesis of flower-like In2O3 as a chemiresistive isoprene sensor for breath analysis

ZnO-Decorated In/Ga Oxide Nanotubes Derived from Bimetallic In/Ga MOFs for Fast Acetone Detection with High Sensitivity and Selectivity

“…Especially, the other peak located at a higher binding energy of 532.68 eV is considered as the oxygen-related vacancy, which is highly related to the final sensing properties. , Although a similar behavior is observed for O 1s in IGO (Figure c), the ratios of oxygen vacancies to lattice oxygen are estimated to be about 0.42 and 0.64 for IGO and IGO@ZnO, respectively. A higher value implies a higher concentration of oxygen vacancies, resulting in increased chance of interaction with the analytical gas . To further confirm the existence of oxygen vacancies, EPR spectroscopic measurements were carried out, which is an effective technology to reveal the intrinsic defects such as vacancies in metal oxides by applying a magnetic field to interact with magnetic dipoles of unpaired electrons .…”

“…Up to now, various types of gas sensors have been developed, and among them, the resistive gas sensors based on semiconductor oxides are popular because of their simple structure and easy fabrication through a cost effective process . In 2 O 3 is an n-type semiconductor material with low resistance and wide band gap (3.55–3.75 eV), which has received extensive attention because of its intrinsic physical and chemical properties, in particular, in gas sensors for gas detection. , Numerous studies exhibited that the unique morphology of In 2 O 3 can greatly help achieve outstanding sensing properties, such as a hierarchical structure, porous structure, and hollow structure. Hollow one-dimensional (1D) nanomaterials possess a high surface-to-volume ratio and large surface area to facilitate gas adsorption and diffusion, leading to significant enhancement in gas sensing performance. , As is well known, the template is an effective way to obtain a 1D nanomaterials.…”

“…6 In 2 O 3 is an n-type semiconductor material with low resistance and wide band gap (3.55−3.75 eV), which has received extensive attention because of its intrinsic physical and chemical properties, in particular, in gas sensors for gas detection. 7,8 Numerous studies exhibited that the unique morphology of In 2 O 3 can greatly help achieve outstanding sensing properties, such as a hierarchical structure, porous structure, and hollow structure. Hollow one-dimensional (1D) nanomaterials possess a high surface-to-volume ratio and large surface area to facilitate gas adsorption and diffusion, leading to significant enhancement in gas sensing performance.…”

Nanostructured Gas Sensors: From Air Quality and Environmental Monitoring to Healthcare and Medical Applications

“…In order to reduce the operating temperature, Han et al [ 75 ] developed a flower-like In 2 O 3 nanostructure using a simple hydrothermal technique, to detect isoprene gas molecules with a very low concentration (5 ppb) at 190 °C. The nanostructure exhibited excellent long-term stability and a quick response dynamic with response time of 53 s. This relatively low operating temperature (190 °C) extends the working life and facilitates the portable application of the sensor.…”

Micropreconcentrators: Recent Progress in Designs and Applications

“…The ability to qualitatively and quantitatively detect the presence of chemicals is one of the foundations of modern society. Chemical sensing and detection methods have found countless applications, with monitoring of technological processes [ 1 , 2 ], controlling product quality [ 3 ], monitoring the environment [ 4 ], diagnostics and health management [ 5 ], as well as constituting an element of early warning systems [ 6 ] being the most significant fields of their use. Although numerous parameters are used to describe the performance of the multitude of existing detection methods, the key parameter for most applications is the limit of detection (LoD), as it describes the lowest concentration of the intended analyte that can be observed via the selected detection method.…”