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Nanomaterials for Sensing Applications
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Nanomaterials for Sensing Applications

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

Deadline for manuscript submissions: closed (10 August 2021) | Viewed by 10831

Special Issue Editors

Dr. Sanli Faez

E-Mail Website
Guest Editor
Physics Department, Utrecht University, Utrecht, The Netherlands
Interests: nano-ionics, nanophotonics, nanoscale electrometry
Dr. Peter Zijlstra

E-Mail Website
Guest Editor
Department of Applied Physics, Eindhoven University of Technology, Eindhoven, The Netherlands
Interests: plasmonic sensors, molecular plasmonics, single-molecule biosensing
Dr. Filiz Yesilkoy

E-Mail Website
Guest Editor
Colleage of Engineering, University of Wisconsin- Madison, Madison, WI 53706, USA
Interests: nanophotonics; metasurfaces; biosensors; bioimaging
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nanomaterials have been one of the main pillars of advancing nanoscience and nanotechnology. From the early days of nanoscience, nanomaterials have been widely investigated as probes for sensing down to the nanoscale. Several processes in biological and solid-state materials have been discovered thanks to the application of nanomaterials. The flexibility of design and production of synthetic nanomaterials has created a wide range of possibilities for building sensors and interactive meta-materials. Furthermore, the drive to studying the interaction with and between nanomaterials at ever shorter length- and time-scales has sparked the development of new nanoscale detection approaches in the past few years. In particular, the marriage between the fields of optics and nanotechnology has resulted in novel sensing modalities built around single-molecules, nanophotonic, and nanoplasmonic structures. Some of these systems exploit strongly confined fields combined with advanced detection schemes that use wave and quantum nature of light.

These developments take place at the interface of physics, chemistry, and materials science, and have created a fertile ground for the exchange of ideas and collaborations. Research in this area spans across the fields of metrology, biophysics, spectroscopy, and quantum optics. The aim of this Special Issue is to give an overview of recent advances in using nanomaterials for sensing applications, and the fundamental research investigations that enables these applications.

Dr. Sanli Faez
Dr. Peter Zijlstra
Dr. Filiz Yesilkoy
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nanoplasmonics
  • nanomaterials
  • nanocrystals
  • nano-colloids
  • nanomedicine
  • nanochemistry
  • single-molecule detection
  • biosensor

Published Papers (3 papers)

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Research

15 pages, 6019 KiB  
Article
Synthesis of Cu2O-Modified Reduced Graphene Oxide for NO2 Sensors
by Manman Huang, Yanyan Wang, Shuyang Ying, Zhekun Wu, Weixiao Liu, Da Chen and Changsi Peng
Sensors 2021, 21(6), 1958; https://doi.org/10.3390/s21061958 - 11 Mar 2021
Cited by 19 | Viewed by 2697
Abstract
Nowadays, metal oxide semiconductors (MOS)-reduced graphene oxide (rGO) nanocomposites have attracted significant research attention for gas sensing applications. Herein, a novel composite material is synthesized by combining two p-type semiconductors, i.e., Cu2O and rGO, and a p-p-type gas sensor is assembled [...] Read more.
Nowadays, metal oxide semiconductors (MOS)-reduced graphene oxide (rGO) nanocomposites have attracted significant research attention for gas sensing applications. Herein, a novel composite material is synthesized by combining two p-type semiconductors, i.e., Cu2O and rGO, and a p-p-type gas sensor is assembled for NO2 detection. Briefly, polypyrrole-coated cuprous oxide nanowires (PPy/Cu2O) are prepared via hydrothermal method and combined with graphene oxide (GO). Then, the nanocomposite (rGO/PPy/Cu2O) is obtained by using high-temperature thermal reduction under Ar atmosphere. The results reveal that the as-prepared rGO/PPy/Cu2O nanocomposite exhibits a maximum NO2 response of 42.5% and is capable of detecting NO2 at a low concentration of 200 ppb. Overall, the as-prepared rGO/PPy/Cu2O nanocomposite demonstrates excellent sensitivity, reversibility, repeatability, and selectivity for NO2 sensing applications. Full article
(This article belongs to the Special Issue Nanomaterials for Sensing Applications)
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13 pages, 1315 KiB  
Communication
Elucidating the Quenching Mechanism in Carbon Dot-Metal Interactions–Designing Sensitive and Selective Optical Probes
by Farah Noun, Evelyne Anastasia Jury and Rafik Naccache
Sensors 2021, 21(4), 1391; https://doi.org/10.3390/s21041391 - 17 Feb 2021
Cited by 31 | Viewed by 4584
Abstract
Overexposure to metals has significant adverse effects on human and animal health coupled with nefarious consequences to the environment. Sensitive tools to measure low contaminant levels exist, but often come at a high cost and require tedious procedures. Thus, there exists a need [...] Read more.
Overexposure to metals has significant adverse effects on human and animal health coupled with nefarious consequences to the environment. Sensitive tools to measure low contaminant levels exist, but often come at a high cost and require tedious procedures. Thus, there exists a need for the development of affordable metal sensors that can offer high sensitivity and selectivity while being accessible on a global scale. Here, carbon dots, prepared in a one-pot synthesis using glutathione and formamide, have been developed as dual fluorescent metal sensing probes. Following extensive characterization of their physico-chemical properties, it is demonstrated that dual fluorescence can be exploited to build a robust ratiometric sensor with low-ppb detection sensitivity in water. This investigation shows that these optical probes are selective for Pb2+ and Hg2+ ions. Using steady-state and dynamic optical characterization techniques, coupled with hard and soft acid-base theory, the underlying reason for this selective behavior was identified. These findings shed light on the nature of metal-carbon dot interactions, which can be used to tailor their properties to target specific metal ions. Finally, these findings can be applicable to other fluorescent nanoparticle systems that are targeted for development as metal sensors. Full article
(This article belongs to the Special Issue Nanomaterials for Sensing Applications)
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17 pages, 4694 KiB  
Article
Modelling and Measurement of Magnetically Soft Nanowire Arrays for Sensor Applications
by Pavel Ripka, Vaclav Grim, Mehran Mirzaei, Diana Hrakova, Janis Uhrig, Florian Emmerich, Christiane Thielemann, Jiri Hejtmanek, Ondrej Kaman and Roman Tesar
Sensors 2021, 21(1), 3; https://doi.org/10.3390/s21010003 - 22 Dec 2020
Cited by 6 | Viewed by 2638
Abstract
Soft magnetic wires and microwires are currently used for the cores of magnetic sensors. Due to their low demagnetization, they contribute to the high sensitivity and the high spatial resolution of fluxgates, Giant Magnetoimpedance (GMI), and inductive sensors. The arrays of nanowires can [...] Read more.
Soft magnetic wires and microwires are currently used for the cores of magnetic sensors. Due to their low demagnetization, they contribute to the high sensitivity and the high spatial resolution of fluxgates, Giant Magnetoimpedance (GMI), and inductive sensors. The arrays of nanowires can be prepared by electrodeposition into predefined pores of a nanoporous polycarbonate membrane. While high coercivity arrays with square loops are convenient for information storage and for bistable sensors such as proximity switches, low coercivity cores are needed for linear sensors. We show that coercivity can be controlled by the geometry of the array: increasing the diameter of nanowires (20 µm in length) from 30 nm to 200 nm reduced the coercivity by a factor of 10, while the corresponding decrease in the apparent permeability was only 5-fold. Finite element simulation of nanowire arrays is important for sensor development, but it is computationally demanding. While an array of 2000 wires can be still modelled in 3D, this is impossible for real arrays containing millions of wires. We have developed an equivalent 2D model, which allows us to solve these large arrays with acceptable accuracy. Using this tool, we have shown that as a core of magnetic sensors, nanowires are efficiently employed only together with microcoils with diameter comparable to the nanowire length. Full article
(This article belongs to the Special Issue Nanomaterials for Sensing Applications)
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