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Nanotechnology for On-Chip Sensing
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Nanotechnology for On-Chip Sensing

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

Deadline for manuscript submissions: closed (28 February 2022) | Viewed by 5016

Special Issue Editors

Prof. Dr. Jaromír Hubálek

E-Mail Website
Guest Editor
CEITEC, Brno University of Technology, Brno, Czech Republic
Interests: sensors; MEMS technology; nanotechnology; functional materials; surface modifications
Dr. Stella Vallejos Vargas

E-Mail Website
Guest Editor
1. IMB-CNM (CSIC), Instituto de Microelectrónica de Barcelona, Barcelona, Spain
2. CEITEC, Brno University of Technology, Brno, Czech Republic
Interests: sensors; micro/nanofabrication; functional nanomaterials; chemical vapor deposition
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nowadays, the development of nanotechnology-based techniques is in a highly advanced stage, providing many options for improving sensors technology and functionality. The aim of this Special Issue is to exhibit the progress in on-chip sensing component developments using nanotechnologies and get insight into the problems already solved, the new findings, and current and future challenges. Works showing a critical view on results assessment, and techniques such as tools for improving key parameters, limits of detection, and efficiency are encouraged. This Special Issue will address challenges in the fabrication of components based on 2D, 1D, and 0D materials and their properties and applications in sensing. The peer-reviewed articles will be a showcase of potential high-impact research topics, new approaches, and directions for the on-chip integration of sensing transducers.

Research topics include:

  • MEMS sensors with sensing nanocomponents
  • NEMS sensors
  • Nanofabricated sensors on unconventional substrates
  • Nanostructures for sensing in gas or liquid media
  • Nanostructures for on-chip biosensors
  • Nanostructures based sensing arrays
  • Nanotechnology based chemical sensing receptors
  • Nanodots, nanopores, nanorods, nanotubes, nanowires, and nanofibers in sensing
  • Graphene, silicene, germanene, and other 2D materials-based sensors
  • Nanotechnology for on-chip optical sensing

Prof. Dr. Jaromír Hubálek
Dr. Stella Vallejos Vargas
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.

Published Papers (2 papers)

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Research

19 pages, 5387 KiB  
Article
Manufacturing and Characterization of Three-Axis Magnetic Sensors Using the Standard 180 nm CMOS Technology
by Chi-Han Wu, Po-Jen Shih, Yao-Chuan Tsai and Ching-Liang Dai
Sensors 2021, 21(21), 6953; https://doi.org/10.3390/s21216953 - 20 Oct 2021
Cited by 4 | Viewed by 1628
Abstract
A three-axis micro magnetic sensor (MS) is developed based on the standard 180 nm complementary metal oxide semiconductor (CMOS) technology. The MS designs two magnetic sensing elements (MSEs), which consists of an x/y-MSE and an z-MSE, to reduce cross-sensitivity. The x/y-MSE is constructed [...] Read more.
A three-axis micro magnetic sensor (MS) is developed based on the standard 180 nm complementary metal oxide semiconductor (CMOS) technology. The MS designs two magnetic sensing elements (MSEs), which consists of an x/y-MSE and an z-MSE, to reduce cross-sensitivity. The x/y-MSE is constructed by an x-MSE and an y-MSE that are respectively employed to detect in the x- and y-direction magnetic field (MF). The z-MSE is used to sense in the z-direction MF. The x/y-MSE, which is constructed by two magnetotransistors, designs four additional collectors that are employed to increase the sensing current and to enhance the sensitivity of the MS. The Sentaurus TCAD software simulates the characteristic of the MS. The measured results reveal that the MS sensitivity is 534 mV/T in the x-direction MF, 525 mV/T in the y-direction MF and 119 mV/T in the z-axis MF. Full article
(This article belongs to the Special Issue Nanotechnology for On-Chip Sensing)
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16 pages, 5734 KiB  
Article
Nd3+-Doped TiO2 Nanoparticles as Nanothermometer: High Sensitivity in Temperature Evaluation inside Biological Windows
by Selene Acosta, Luis J. Borrero-González, Polona Umek, Luiz A. O. Nunes, Peter Guttmann and Carla Bittencourt
Sensors 2021, 21(16), 5306; https://doi.org/10.3390/s21165306 - 06 Aug 2021
Cited by 3 | Viewed by 2749
Abstract
TiO2 nanoparticles doped with different amounts of Nd3+ (0.5, 1, and 3 wt.%) were synthetized by the sol–gel method, and evaluated as potential temperature nanoprobes using the fluorescence intensity ratio between thermal-sensitive radiative transitions of the Nd3+. XRD characterization [...] Read more.
TiO2 nanoparticles doped with different amounts of Nd3+ (0.5, 1, and 3 wt.%) were synthetized by the sol–gel method, and evaluated as potential temperature nanoprobes using the fluorescence intensity ratio between thermal-sensitive radiative transitions of the Nd3+. XRD characterization identified the anatase phase in all the doped samples. The morphology of the nanoparticles was observed with SEM, TEM and HRTEM microscopies. The relative amount of Nd3+ in TiO2 was obtained by EDXS, and the oxidation state of titanium and neodymium was investigated via XPS and NEXAFS, respectively. Nd3+ was present in all the samples, unlike titanium, where besides Ti4+, a significantly amount of Ti3+ was observed; the relative concentration of Ti3+ increased as the amount of Nd3+ in the TiO2 nanoparticles increased. The photoluminescence of the synthetized nanoparticles was investigated, with excitation wavelengths of 350, 514 and 600 nm. The emission intensity of the broad band that was associated with the presence of defects in the TiO2, increased when the concentration of Nd3+ was increased. Using 600 nm for excitation, the 4F7/2→4I9/2, 4F5/2→4I9/2 and 4F3/2→4I9/2 transitions of Nd3+ ions, centered at 760 nm, 821 nm, and 880 nm, respectively, were observed. Finally, the effect of temperature in the photoluminescence intensity of the synthetized nanoparticles was investigated, with an excitation wavelength of 600 nm. The spectra were collected in the 288–348 K range. For increasing temperatures, the emission intensity of the 4F7/2→4I9/2 and 4F5/2→4I9/2 transitions increased significantly, in contrast to the 4F3/2→4I9/2 transition, in which the intensity emission decreased. The fluorescence intensity ratio between the transitions I821I880=F5/24I49/2F43/2I49/2 and I760I880=F47/2I49/2F43/2I49/2 were used to calculate the relative sensitivity of the sensors. The relative sensitivity was near 3% K−1 for I760I880 and near 1% K−1 for I821I880. Full article
(This article belongs to the Special Issue Nanotechnology for On-Chip Sensing)
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