Carbon nanotubes immobilized on gold electrode as an electrochemical humidity sensor

Kim, Han-Sem; Kim, Ju Hyeon; Park, Sang-Yu; Kang, Jian; Kim, Sungjin; Choi, Young-Bong; Shin, Ueon Sang

doi:10.1016/j.snb.2019.127049

Cited by 38 publications

(19 citation statements)

References 51 publications

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“…As the table shows, the capacitive sensors are the most sensitive, followed by the optical Tungsten disulfide sensor. Other portable humidity sensors are also reported in the literature [ 53 , 54 , 72 , 73 , 74 , 75 ], with some of them being non-portable [ 76 , 77 , 78 , 79 ]. Capacitive humidity sensors are fabricated using porous or hydrophobic materials between electrodes to detect the capacitance change at different relative humidity levels.…”

Section: Discussion and Future Workmentioning

confidence: 99%

Survey of Saliva Components and Virus Sensors for Prevention of COVID-19 and Infectious Diseases

et al. 2020

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The United States Centers for Disease Control and Prevention considers saliva contact the lead transmission mean of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which causes the coronavirus disease 2019 (COVID-19). Saliva droplets or aerosols expelled by sneezing, coughing, breathing, and talking may carry this virus. People in close distance may be exposed directly to these droplets or indirectly when touching the droplets that fall on surrounding surfaces and ending up contracting COVID-19 after touching the mucosa tissue of their faces. It is of great interest to quickly and effectively detect the presence of SARS-CoV-2 in an environment, but the existing methods only work in laboratory settings, to the best of our knowledge. However, it may be possible to detect the presence of saliva in the environment and proceed with prevention measures. However, detecting saliva itself has not been documented in the literature. On the other hand, many sensors that detect different organic components in saliva to monitor a person’s health and diagnose different diseases, ranging from diabetes to dental health, have been proposed and they may be used to detect the presence of saliva. This paper surveys sensors that detect organic and inorganic components of human saliva. Humidity sensors are also considered in the detection of saliva because a large portion of saliva is water. Moreover, sensors that detect infectious viruses are also included as they may also be embedded into saliva sensors for a confirmation of the presence of the virus. A classification of sensors by their working principles and the substances they detect is presented, including the sensors’ specifications, sample size, and sensitivity. Indications of which sensors are portable and suitable for field application are presented. This paper also discusses future research and challenges that must be resolved to realize practical saliva sensors. Such sensors may help minimize the spread of not only COVID-19 but also other infectious diseases.

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Section: Discussion and Future Workmentioning

confidence: 99%

Survey of Saliva Components and Virus Sensors for Prevention of COVID-19 and Infectious Diseases

et al. 2020

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“…Monitoring humidity is critical in several areas such as civil engineering [167], soils [168], and food packaging [169]. There is a variety of studied, developed, and commercialized electrochemical humidity sensors (HS) that are based on conductivity measures [170][171][172], humidity sensitive polymers in which the material properties change work as sensors [173,174] and OFS [62,175].…”

Section: Ofs For Moisture Monitoringmentioning

confidence: 99%

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

et al. 2021

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The use of advanced sensing devices for concrete and reinforced concrete structures (RCS) is considered a rational approach for the assessment of repair options and scheduling of inspection and maintenance strategies. The immediate benefits are cost reduction and a reliable prevention of unpredictable events. The use of optical fiber sensors (OFS) for such purposes has increased considerably in the last few years due to their intrinsic advantages. In most of the OFS, the chemical transducer consists of immobilized chemical reagents placed in the sensing region of the optical sensor by direct deposition or by encapsulation in a polymeric matrix. The choice of the support matrix impacts directly on the performance of the OFS. In the last two decades, the development of OFS functionalized with organic–inorganic hybrid (OIH) sol–gel membranes have been reported. Sol–gel route is considered a simple method that offers several advantages when compared to traditional synthesis processes, allowing to obtain versatile materials with unique chemical and physical properties, and is particularly valuable in the design of OIH materials. This review will provide an update of the current state-of-the-art of the OFS based on OIH sol-gel materials for concrete and RCS since 2016 until mid-2021. The main achievements in the synthesis of OIH membranes for deposition on OFS will be discussed. The challenges and future directions in this field will also be considered, as well as the main limitations of OFS for RCS monitoring.

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“…A nanohybrid consisting of MWCNTs and chitosan was immobilized onto the surface of a gold electrode by drop-casting [98]. This nanohybrid had a role of a "conductive bridge" between two separated gold surfaces, printed on an alumina substrate.…”

Section: Carbon-based Nps-pe Compositementioning

confidence: 99%

Polyelectrolytes Assembly: A Powerful Tool for Electrochemical Sensing Application

Rončević

Krivić

Buljac

et al. 2020

Sensors

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The development of sensing coatings, as important sensor elements that integrate functionality, simplicity, chemical stability, and physical stability, has been shown to play a major role in electrochemical sensing system development trends. Simple and versatile assembling procedures and scalability make polyelectrolytes highly convenient for use in electrochemical sensing applications. Polyelectrolytes are mainly used in electrochemical sensor architectures for entrapping (incorporation, immobilization, etc.) various materials into sensing layers. These materials can often increase sensitivity, selectivity, and electronic communications with the electrode substrate, and they can mediate electron transfer between an analyte and transducer. Analytical performance can be significantly improved by the synergistic effect of materials (sensing material, transducer, and mediator) present in these composites. As most reported methods for the preparation of polyelectrolyte-based sensing layers are layer-by-layer and casting/coating methods, this review focuses on the use of the latter methods in the development of electrochemical sensors within the last decade. In contrast to many reviews related to electrochemical sensors that feature polyelectrolytes, this review is focused on architectures of sensing layers and the role of polyelectrolytes in the development of sensing systems. Additionally, the role of polyelectrolytes in the preparation and modification of various nanoparticles, nanoprobes, reporter probes, nanobeads, etc. that are used in electrochemical sensing systems is also reviewed.

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Carbon nanotubes immobilized on gold electrode as an electrochemical humidity sensor

Cited by 38 publications

References 51 publications

Survey of Saliva Components and Virus Sensors for Prevention of COVID-19 and Infectious Diseases

Survey of Saliva Components and Virus Sensors for Prevention of COVID-19 and Infectious Diseases

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

Polyelectrolytes Assembly: A Powerful Tool for Electrochemical Sensing Application

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