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Special Issue "Nanomaterials for Environmental and Biological Monitoring"

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Biosensors".

Deadline for manuscript submissions: closed (31 October 2021) | Viewed by 3488

Special Issue Editor

Prof. Dr. Ki-Hyun Kim
grade E-Mail Website1 Website2
Guest Editor
Department of Civil & Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Korea
Interests: environmental & biomedical monitoring; air quality & environmental engineering; material engineering; coordination polymers; metal-organic frameworks (MOFs)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleague,

Over the past decades, advances in nanotechnology have been achieved through the synthesis and/or production of new and improved nanomaterials (NMs: e.g., imprinted polymers (IPs), metal–organic frameworks (MOFs), carbon nanotubes (CNTs), quantum dots (QDs), metal oxides (MOs), and their diverse derivatives). These NMs have been applied extensively to develop various sensing tools and devices in various fields due to their numerous favorable properties in terms of porosity, surface area, pore volume, receptor sites, thermal and chemical stability, selectivity, low toxicity, luminescence, and chemical functionality. The introduction of these advanced functional NMs has contributed greatly to the progress of NM-based sensing technology to resolve the limitations that conventional methods suffer from. In light of this advancement in NM-based sensing technology, this Special Issue is proposed to invite researchers who have been involved in the development and application of sensing techniques to detect various targets (metals, organics, and biological targets) in diverse environmental or biological media.

Prof. Dr. Ki-Hyun Kim
Guest Editor

Manuscript Submission Information

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Keywords

  • materials
  • sensing
  • functionality
  • synthesis
  • modification

Published Papers (2 papers)

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Research

Article
Linker-Free Magnetite-Decorated Gold Nanoparticles (Fe3O4-Au): Synthesis, Characterization, and Application for Electrochemical Detection of Arsenic (III)
Sensors 2021, 21(3), 883; https://doi.org/10.3390/s21030883 - 28 Jan 2021
Cited by 8 | Viewed by 1760
Abstract
Linker-free magnetite nanoparticles (Fe3O4NPs)-decorated gold nanoparticles (AuNPs) were grown using a new protocol that can be used as a new platform for synthesis of other intact metal–metal oxide nanocomposites without the need for linkers. This minimizes the distance between [...] Read more.
Linker-free magnetite nanoparticles (Fe3O4NPs)-decorated gold nanoparticles (AuNPs) were grown using a new protocol that can be used as a new platform for synthesis of other intact metal–metal oxide nanocomposites without the need for linkers. This minimizes the distance between the metal and metal oxide nanoparticles and ensures the optimum combined effects between the two material interfaces. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy confirmed the successful synthesis of the Fe3O4-Au nanocomposite, without any change in the magnetite phase. Characterization, using transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy, revealed the composite to consist of AuNPs of 70 ± 10 nm diameter decorated with tiny 10 ± 3 nm diameter Fe3O4NPs in Au:Fe mass ratio of 5:1. The prepared Fe3O4-Au nanocomposite was embedded in ionic liquid (IL) and applied for the modification of glassy carbon electrode (GCE) for the electrochemical detection of As(III) in water. By combining the excellent catalytic properties of the AuNPs with the high adsorption capacity of the tiny Fe3O4NPs towards As(III), as well as the good conductivity of IL, the Fe3O4-Au-IL nanocomposite showed excellent performance in the square wave anodic stripping voltammetry detection of As(III). Under the optimized conditions, a linear range of 1 to 100 μg/L was achieved with a detection limit of 0.22 μg/L (S/N = 3), and no interference from 100-fold higher concentrations of a wide variety of cations and anions found in water. A very low residual standard deviation of 1.16% confirmed the high precision/reproducibility of As(III) analysis and the reliability of the Fe3O4-Au-IL sensing interface. Finally, this proposed sensing interface was successfully applied to analyzing synthetic river and wastewater samples with a 95–101% recovery, demonstrating excellent accuracy, even in complex synthetic river and wastewater samples containing high concentrations of humic acid without any sample pretreatments. Full article
(This article belongs to the Special Issue Nanomaterials for Environmental and Biological Monitoring)
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Article
Cu2O/PEDOT:PSS/ZnO Nanocomposite Material Biosensor for Esophageal Cancer Detection
Sensors 2020, 20(9), 2455; https://doi.org/10.3390/s20092455 - 26 Apr 2020
Cited by 3 | Viewed by 1422
Abstract
A highly sensitive photoelectrochemical (PEC) biosensor without external bias was developed in this study. The biosensor was configured with a p-Cu2O and n-ZnO heterostructure. Hexamethylenetetramine (HMTA) and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) was used to improve the crystal structure of Cu2 [...] Read more.
A highly sensitive photoelectrochemical (PEC) biosensor without external bias was developed in this study. The biosensor was configured with a p-Cu2O and n-ZnO heterostructure. Hexamethylenetetramine (HMTA) and poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) was used to improve the crystal structure of Cu2O and ZnO and reduce the defects in the Cu2O/ZnO interface. This fabrication method provided the highly crystallized Cu2O/ZnO structure with excellent electrical property and photoresponse in visible light. The structure was applied to a biosensor for detecting two different cancerous levels of esophageal cells, namely, OE21 and OE21-1, with a high gain in photocurrent (5.8 and 6.2 times, respectively) and a low detection limit (3000 cells in 50 μL). We believe that such a p-n heterojunction PEC biosensor could advance biosensor development and provide a promising candidate for biomedical applications. Full article
(This article belongs to the Special Issue Nanomaterials for Environmental and Biological Monitoring)
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