Gas sensing materials roadmap

Lee

et al. 2022

Sensors

Herein, state-of-the-art research advances in South Korea regarding the development of chemical sensing materials and fully integrated Internet of Things (IoT) sensing platforms were comprehensively reviewed for verifying the applicability of such sensing systems in point-of-care testing (POCT). Various organic/inorganic nanomaterials were synthesized and characterized to understand their fundamental chemical sensing mechanisms upon exposure to target analytes. Moreover, the applicability of nanomaterials integrated with IoT-based signal transducers for the real-time and on-site analysis of chemical species was verified. In this review, we focused on the development of noble nanostructures and signal transduction techniques for use in IoT sensing platforms, and based on their applications, such systems were classified into gas sensors, ion sensors, and biosensors. A future perspective for the development of chemical sensors was discussed for application to next-generation POCT systems that facilitate rapid and multiplexed screening of various analytes.

Section: Gas Sensorsmentioning

confidence: 99%

Nanomaterials for IoT Sensing Platforms and Point-of-Care Applications in South Korea

Lee

et al. 2022

Sensors

21st Century Nanostructured Materials - Physics, Chemistry, Classification, and Emerging Applications in Industry, Biomedicine,

“…MOS has been used as primarily sensitive materials in conductometric chemical sensors due to their outstanding physical and chemical properties. MOS can be produced by a large number of cost-effective synthetic methods, have shown to be active to detect chemical analytes, and their energy band alignment has proved to be suitable to immobilize biomolecules (e.g., enzymes, antibodies, DNA) [2,18]. MOS are classified according to their conductivity as n-type and p-type, in which the charge carriers are electrons and holes, respectively.…”

Section: Metal Oxide Semiconductorsmentioning

confidence: 99%

“…Further, the functionalization or modification of MOS nanostructures by loading, doping, surface-decoration or hybridization with second-phase constituents (e.g., noble metals, other MOS, carbon-based materials) showed other ways to enhance and extend the capabilities of the receptor [35,36]. Similarly, in biochemical sensors, the functionalization of the surface by immobilizing biomolecules that act as biological recognition elements of specific analytes (e.g., glucose, urea, cancer cells, viruses) is mandatory to sensitize the MOS surface [2,18,37].…”

Section: Functionalized Metal Oxide Semiconductorsmentioning

confidence: 99%

“…Esther Hontañón 1 * and Stella Vallejos 2 1 Institute of Physical and Information Technologies, Spanish National Research Council, Madrid, Spain 2 Institute of Microelectronics of Barcelona, Spanish National Research Council, Cerdanyola del Vallès, Barcelona, Spain *Address all correspondence to: esther.hontanon@csic.es Traditional synthetic methods based on nucleation and growth processes, such as hydrothermal synthesis and chemical vapor deposition, must be exploited to allow one-step integration of 1D MOS nanostructures with transducer platforms. These techniques are appropriate for direct integration, particularly with siliconbased platforms.…”

Section: Author Detailsmentioning

confidence: 99%

“…On one hand, MOS can be produced by low-cost wet-chemical synthesis routes from earth-abundant low-cost precursors and are, in general, non-toxic. On the other hand, MOS exhibit unique electronic, chemical and physical properties that are often sensitive to changes in their environment, making them suitable for chemical sensing [2][3][4]. Finally, the MOS sensors are relatively easy to be miniaturized and integrated into microfabrication processes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

One-Dimensional Metal Oxide Nanostructures for Chemical Sensors

Hontañón¹,

Vallejos²

2022

The fabrication of chemical sensors based on one-dimensional (1D) metal oxide semiconductor (MOS) nanostructures with tailored geometries has rapidly advanced in the last two decades. Chemical sensitive 1D MOS nanostructures are usually configured as resistors whose conduction is altered by a charge-transfer process or as field-effect transistors (FET) whose properties are controlled by applying appropriate potentials to the gate. This chapter reviews the state-of-the-art research on chemical sensors based on 1D MOS nanostructures of the resistive and FET types. The chapter begins with a survey of the MOS and their 1D nanostructures with the greatest potential for use in the next generation of chemical sensors, which will be of very small size, low-power consumption, low-cost, and superior sensing performance compared to present chemical sensors on the market. There follows a description of the 1D MOS nanostructures, including composite and hybrid structures, and their synthesis techniques. And subsequently a presentation of the architectures of the current resistive and FET sensors, and the methods to integrate the 1D MOS nanostructures into them on a large scale and in a cost-effective manner. The chapter concludes with an outlook of the challenges facing the chemical sensors based on 1D MOS nanostructures if their massive use in sensor networks becomes a reality.

Balancing Pd–H Interactions: Thiolate‐Protected Palladium Nanoclusters for Robust and Rapid Hydrogen Gas Sensing

Chen,

Yuan,

Chen

et al. 2024

Advanced Materials

The transition toward hydrogen gas (H2) as an eco‐friendly and renewable energy source necessitates advanced safety technologies, particularly robust sensors for H2 leak detection and concentration monitoring. Although palladium (Pd)‐based materials are preferred for their strong H2 affinity, intense palladium–hydrogen (Pd–H) interactions lead to phase transitions to palladium hydride (PdHx), compromising sensors’ durability and detection speeds after multiple uses. In response, this study introduces a high‐performance H2 sensor designed from thiolate‐protected Pd nanoclusters (Pd8SR16), which leverages the synergistic effect between the metal and protective ligands to form an intermediate palladium–hydrogen–sulfur (Pd–H–S) state during H2 adsorption. Striking a balance, it preserves Pd–H binding affinity while preventing excessive interaction, thus lowering the energy required for H2 desorption. The dynamic adsorption‐dissociation‐recombination‐desorption process is efficiently and highly reversible with Pd8SR16, ensuring robust and rapid H2 sensing at parts per million (ppm). The Pd8SR16‐based sensor demonstrates exceptional stability (50 cycles; 0.11% standard deviation in response), prompt response/recovery (t90 = 0.95 s/6 s), low limit of detection (LoD, 1 ppm), and ambient temperature operability, ranking it among the most sensitive Pd‐based H2 sensors. Furthermore, a multifunctional prototype demonstrates the practicality of real‐world gas sensing using ligand‐protected metal nanoclusters.