Chemical Sensors: Acoustic Gas Sensors

Balasingam, Jenitha Antony; Swaminathan, Siddharth; Nazemi, Haleh; Love, Calvin; Birjis, Yumna; Emadi, Arezoo

doi:10.1016/b978-0-12-822548-6.00001-7

Cited by 7 publications

(4 citation statements)

References 57 publications

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“…A decrease in the vibration frequency indicates an increase in the thickness of the adsorbed material. The device consists of a piezoelectric quartz crystal located between the top and bottom electrodes, and starts to vibrate upon the application of potential, which causes the crystal to vibrate at a resonance frequency [ 144 , 145 , 146 , 147 ].…”

Section: Interaction and Morphology Studiesmentioning

confidence: 99%

Analytical Techniques for the Characterization of Bioactive Coatings for Orthopaedic Implants

Kravanja

Finšgar

2021

Biomedicines

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The development of bioactive coatings for orthopedic implants has been of great interest in recent years in order to achieve both early- and long-term osseointegration. Numerous bioactive materials have been investigated for this purpose, along with loading coatings with therapeutic agents (active compounds) that are released into the surrounding media in a controlled manner after surgery. This review initially focuses on the importance and usefulness of characterization techniques for bioactive coatings, allowing the detailed evaluation of coating properties and further improvements. Various advanced analytical techniques that have been used to characterize the structure, interactions, and morphology of the designed bioactive coatings are comprehensively described by means of time-of-flight secondary ion mass spectrometry (ToF-SIMS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), 3D tomography, quartz crystal microbalance (QCM), coating adhesion, and contact angle (CA) measurements. Secondly, the design of controlled-release systems, the determination of drug release kinetics, and recent advances in drug release from bioactive coatings are addressed as the evaluation thereof is crucial for improving the synthesis parameters in designing optimal bioactive coatings.

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Section: Interaction and Morphology Studiesmentioning

confidence: 99%

Analytical Techniques for the Characterization of Bioactive Coatings for Orthopaedic Implants

Kravanja

Finšgar

2021

Biomedicines

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“…Over the past few decades, a broad variety of nanomaterials including carbon materials, [28,29] conducting polymers, [30] metal oxides, [31][32][33] two dimensional (2D) layered materials, [34] and solid electrolytes, [35] etc., have been widely employed in construction of gas sensors. Metal oxides-based sensors are of immense interest and are widely being employed for gas sensing because of their size dependent features, such as size in the range of 1-100 nm.…”

Section: R E V I E W T H E C H E M I C a L R E C O R Dmentioning

confidence: 99%

Designing State‐of‐the‐Art Gas Sensors: From Fundamentals to Applications

Humayun,

Bououdina,

Usman

et al. 2024

The Chemical Record

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Gas sensors are crucial in environmental monitoring, industrial safety, and medical diagnostics. Due to the rising demand for precise and reliable gas detection, there is a rising demand for cutting‐edge gas sensors that possess exceptional sensitivity, selectivity, and stability. Due to their tunable electrical properties, high‐density surface‐active sites, and significant surface‐to‐volume ratio, nanomaterials have been extensively investigated in this regard. The traditional gas sensors utilize homogeneous material for sensing where the adsorbed surface oxygen species play a vital role in their sensing activity. However, their performance for selective gas sensing is still unsatisfactory because the employed high temperature leads to the poor stability. The heterostructures nanomaterials can easily tune sensing performance and their different energy band structures, work functions, charge carrier concentration and polarity, and interfacial band alignments can be precisely designed for high‐performance selective gas sensing at low temperature. In this review article, we discuss in detail the fundamentals of semiconductor gas sensing along with their mechanisms. Further, we highlight the existed challenges in semiconductor gas sensing. In addition, we review the recent advancements in semiconductor gas sensor design for applications from different perspective. Finally, the conclusion and future perspectives for improvement of the gas sensing performance are discussed.

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“…For example, a typical surface acoustic wave (SAW) sensor consists of a piezoelectric substrate, one or more interdigitated transducers (IDTs, or interdigitated electrodes) on the substrate, and a sensing layer. 143 SAWs are excited when AC signals are applied to one of the IDTs, and the waves propagate along the surface of the substrate and can be detected by other IDTs to identify the alterations of physical properties such as the mass of the sensing layer. 144 In contrast to sensing, acoustic transducers may cause droplet motion and are widely implemented in particle manipulation and droplet handling.…”

Section: Acoustic Sensing and Manipulationmentioning

confidence: 99%