Advances and Challenges in Nano-Functional Materials for Detection Applications

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanoelectronics, Nanosensors and Devices".

Deadline for manuscript submissions: closed (15 September 2023) | Viewed by 1502

Special Issue Editor


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Guest Editor
Department of Chemical Engineering, Dankook University, Yongin 16890, Republic of Korea
Interests: nanomaterial; gas sensor; photodetector; RF power device; light-emitting diodes

Special Issue Information

Dear Colleagues,

The demand for sensors has grown over the decades, particularly in the era of Internet of Things (IoT). The large size, complex, and high-cost detecting instruments are replaced by the compact, simplified, and economical sensors, which are integrated with or employed in consumer electronics, smart devices, autonomous vehicles, or point-of-care testing (POCT). The universal use of sensors improves the quality of human life and reduces the incidence of disease and social accidents. These sensors require high responsivity and sensitivity, excellent selectivity, fast response time, and low power consumption, and  intensive and extensive research has endeavored to satisfy these requirements. As a milestone of this endeavor, nanomaterials with decent chemical and physical properties—including extended surface area, superior catalytic activity, quantum confinement, and mechanical flexibility—pave the way for the next-generation sensors. However, challenges also arise, such as uniform quality control and the stable reliability of nanomaterials for scale-up production.

This Special Issue will cover comprehensive research subjects on the advances and challenges in nano-functional materials for detection applications. It aims to attract researchers, in order to share the current state-of-the-art knowledge of sensing nanomaterials and to foster new ideas for future detection applications. I invite authors to contribute original research articles and review articles presenting the current progress on nanomaterial-based sensors. Potential topics include, but are not limited to gas sensors, liquid sensors, bio-sensors, photodetectors, and physical sensors.

Prof. Dr. Soohwan Jang
Guest Editor

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Keywords

  • gas sensor
  • liquid sensor
  • bio-sensor
  • photodetector
  • physical sensor
  • metal
  • oxide
  • nitride
  • 2D material

Published Papers (2 papers)

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Research

13 pages, 3070 KiB  
Article
Potential of Carbon Nanotube Chemiresistor Array in Detecting Gas-Phase Mixtures of Toxic Chemical Compounds
by Seongwoo Lee, Sanghwan Park, Seongyeop Lim, Cheongha Lee and Chang Young Lee
Nanomaterials 2023, 13(15), 2199; https://doi.org/10.3390/nano13152199 - 28 Jul 2023
Viewed by 986
Abstract
Toxic industrial chemicals (TICs), when accidentally released into the workplace or environment, often form a gaseous mixture that complicates detection and mitigation measures. However, most of the existing gas sensors are unsuitable for detecting such mixtures. In this study, we demonstrated the detection [...] Read more.
Toxic industrial chemicals (TICs), when accidentally released into the workplace or environment, often form a gaseous mixture that complicates detection and mitigation measures. However, most of the existing gas sensors are unsuitable for detecting such mixtures. In this study, we demonstrated the detection and identification of gaseous mixtures of TICs using a chemiresistor array of single-walled carbon nanotubes (SWCNTs). The array consists of three SWCNT chemiresistors coated with different molecular/ionic species, achieving a limit of detection (LOD) of 2.2 ppb for ammonia (NH3), 820 ppb for sulfur dioxide (SO2), and 2.4 ppm for ethylene oxide (EtO). By fitting the concentration-dependent sensor responses to an adsorption isotherm, we extracted parameters that characterize each analyte-coating combination, including the proportionality and equilibrium constants for adsorption. Principal component analysis confirmed that the sensor array detected and identified mixtures of two TIC gases: NH3/SO2, NH3/EtO, and SO2/EtO. Exposing the sensor array to three TIC mixtures with various EtO/SO2 ratios at a fixed NH3 concentration showed an excellent correlation between the sensor response and the mixture composition. Additionally, we proposed concentration ranges within which the sensor array can effectively detect the gaseous mixtures. Being highly sensitive and capable of analyzing both individual and mixed TICs, our gas sensor array has great potential for monitoring the safety and environmental effects of industrial chemical processes. Full article
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14 pages, 2321 KiB  
Article
Liquid-Metal Core–Shell Particles Coated with Folate and Phospholipids for Targeted Drug Delivery and Photothermal Treatment of Cancer Cells
by Suyeon Ahn, Seung Hyun Kang, Hyunjeong Woo, Kyobum Kim, Hyung-Jun Koo, Hee-Young Lee, Yonghyun Choi, Shin Hyuk Kang and Jonghoon Choi
Nanomaterials 2023, 13(13), 2017; https://doi.org/10.3390/nano13132017 - 6 Jul 2023
Cited by 2 | Viewed by 1619
Abstract
Recently, several methods have been used for cancer treatment. Among them, chemotherapy is generally used, but general anticancer drugs may affect normal cells and tissues, causing various side effects. To reduce the side effects and increase the efficacy of anticancer drugs, a folate-based [...] Read more.
Recently, several methods have been used for cancer treatment. Among them, chemotherapy is generally used, but general anticancer drugs may affect normal cells and tissues, causing various side effects. To reduce the side effects and increase the efficacy of anticancer drugs, a folate-based liquid-metal drug nanodelivery system was used to target the folate receptor, which is highly expressed in cancer cells. A phospholipid-based surface coating was formed on the surface of liquid-metal nanoparticles to increase their stability, and doxorubicin was loaded as a drug delivery system. Folate on the lipid shell surface increased the efficiency of targeting cancer cells. The photothermal properties of liquid metal were confirmed by near-infrared (NIR) laser irradiation. After treating cancerous and normal cells with liquid-metal particles and NIR irradiation, the particles were specifically bound to cancer cells for drug uptake, confirming photothermal therapy as a drug delivery system that is expected to induce cancer cell death through comprehensive effects such as vascular embolization in addition to targeting cancer cells. Full article
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