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Recent Advances in Highly Sensitive Nanosensors for Chemical and Biomedical Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Nanotechnology and Applied Nanosciences".

Deadline for manuscript submissions: closed (29 February 2020) | Viewed by 10194

Special Issue Editor

Dr. Junseop Lee

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, Gachon University, 1342 Seongnam-Daero, Sujeong-Gu, Seongnam-si 13120, Republic of Korea
Interests: FET biosensors; image sensors; fluorescent sensors; wireless smart sensors; RFID wireless sensing networks; functional polymers; conducting polymer nanomaterials; inorganic nanomaterials; composite nanomaterials; electronic signal transport in nanomaterials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Recently, many efforts have been made to live a healthy, pleasant, and comfortable life along with an improvement in the quality of human life. Sensors, which measure changes in the environment or changes in disease factors, are one of the essential factors in improving the quality of life, whose demand is expected to increase in the future. Current sensor studies have been conducted using functional nanomaterials (i.e., nanosensor) with unique physical, chemical, mechanical, and optical properties derived from small scales. In the field of nanotechnology, nanosensors are instrumental for monitoring physical and chemical phenomena in regions difficult to reach, detecting biochemicals in cellular organelles, and measuring nanoscopic particles in the industry and environment. In addition, the integration of nanosensors into wireless communication networks is of particular interest because of the nonobtrusive nature of the installation, high nodal densities, and low costs (without the need for extensive wiring).

The aim of this Special Issue is to attract leading researchers in the area of nanosensors in an effort to highlight the latest exciting developments to promote concrete applications. Accepted contributions will include (1) the synthesis and fundamental properties of functional nanomaterials for components in the nanosensor, (2) the alternative design of the sensor device, and (3) their applications to chemical/biological detections.

Prof. Dr. Junseop Lee
Guest Editor

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Keywords

  • Nanosensor
  • Biosensor
  • Chemical sensor
  • Medical sensor
  • Wireless sensor
  • MEMS
  • Non-enzyme sensor
  • Conductive nanomaterials
  • Semiconducting materials
  • Composite nanomaterials
  • Aptamer
  • Nanotechnology

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Published Papers (2 papers)

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Research

13 pages, 5037 KiB  
Article
Comparative Study on the Effect of Protonation Control for Resistive Gas Sensor Based on Close-Packed Polypyrrole Nanoparticles
by Wooyoung Kim, Sunghun Cho and Jun Seop Lee
Appl. Sci. 2020, 10(5), 1850; https://doi.org/10.3390/app10051850 - 8 Mar 2020
Cited by 6 | Viewed by 3815
Abstract
Conducting polymers are often used as sensor electrodes due to their conjugated chain structure, which leads to high sensitivity and rapid response at room temperature. Numerous studies have been conducted on the structures of conducting polymer nanomaterials to increase the active surface area [...] Read more.
Conducting polymers are often used as sensor electrodes due to their conjugated chain structure, which leads to high sensitivity and rapid response at room temperature. Numerous studies have been conducted on the structures of conducting polymer nanomaterials to increase the active surface area for the target materials. However, studies on the control of the chemical state of conducting polymer chains and the modification of the sensing signal transfer with these changes have not been reported. In this work, polypyrrole nanoparticles (PPyNPs), where is PPy is a conducting polymer, are applied as a sensor transducer to analyze the chemical sensing ability of the electrode. In particular, the protonation of PPy is adjusted by chemical methods to modify the transfer sensing signals with changes in the polymer chain structure. The PPyNPs that were modified at pH 1 exhibit high sensitivity to the target analyte (down to 1 ppb of NH3) with short response and recovery times of less than 20 s and 50 s, respectively, at 25 °C. Full article
(This article belongs to the Special Issue Recent Advances in Highly Sensitive Nanosensors for Chemical and Biomedical Applications)
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19 pages, 5781 KiB  
Article
Extracellular Oxygen Sensors Based on PtTFPP and Four-Arm Block Copolymers
by Yuan Qiao, Tingting Pan, Jiaze Li, Cheng Yang, Jiaxing Wen, Ke Zhong, Shanshan Wu, Fengyu Su and Yanqing Tian
Appl. Sci. 2019, 9(20), 4404; https://doi.org/10.3390/app9204404 - 17 Oct 2019
Cited by 6 | Viewed by 5898
Abstract
Three four-arm amphiphilic block copolymers with different chain lengths, consisting of a hydrophilic chain of polyethylene glycol (PEG) and hydrophobic segment of polycaprolactam (PCL), were synthesized and used to encapsulate the high-efficient and hydrophobic oxygen probe of platinum(II)-5,10,15,20-tetrakis-(2,3,4,5,6-pentafluorophenyl)-porphyrin (PtTFPP) to form polymer micelles. [...] Read more.
Three four-arm amphiphilic block copolymers with different chain lengths, consisting of a hydrophilic chain of polyethylene glycol (PEG) and hydrophobic segment of polycaprolactam (PCL), were synthesized and used to encapsulate the high-efficient and hydrophobic oxygen probe of platinum(II)-5,10,15,20-tetrakis-(2,3,4,5,6-pentafluorophenyl)-porphyrin (PtTFPP) to form polymer micelles. This approach enabled the use of PtTFPP in aqueous solution for biosensing. Experimental results demonstrated that the particle sizes of these nano-oxygen sensors between 40.0 and 203.8 nm depend on the structures of block copolymers. PtTFPP in these micelles showed an effective quantum yield under nitrogen environment, ranging from 0.06 to 0.159. The new sensors are suitable for analyzing dissolved oxygen concentrations in the range of 0.04–39.3 mg/L by using the linear Stern–Volmer equation at room temperature. In addition, it has been shown that these sensors are capable of in situ monitoring the dissolved oxygens in the culture medium of E. coli and Romas cells during the respiration process, and distinguishing the drug activity of antibiotic ampicillin from that of antimycin A. This study showed that the use of these nanostructured multi-arm block copolymer micelles can achieve efficient biological applications without specific structural modification of the hydrophobic PtTFPP probe, which is expected to have broad prospects. Full article
(This article belongs to the Special Issue Recent Advances in Highly Sensitive Nanosensors for Chemical and Biomedical Applications)
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