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Chemosensors
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Quantum-Dots Sensors
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Quantum-Dots Sensors

A special issue of Chemosensors (ISSN 2227-9040). This special issue belongs to the section "Materials for Chemical Sensing".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 12713

Special Issue Editor

Dr. Gabriella Leo

E-Mail Website
Guest Editor
Institute for the Study of Nanostructured Materials (ISMN), CNR Via Salaria km 29.300 00015 Monterotondo St. Rome, Italy
Interests: gas sensors; photodetectors based on inorganic quantum dots of compound semiconductors and oxides

Special Issue Information

Dear Colleagues,

The quantum confinement effects, the large surface-to-volume ratio, and the peculiar surface chemistry of quantum dots give such nanosized materials a tremendous potential as sensing tools in several applications, such as food and water analysis, environmental monitoring, bio-medical, safety and security, photonics, or space. To pave the way to high-performance sensors exploiting the unique properties of quantum dots, the last decades have seen a growing interest in the research and development of new nanosized inorganic and organic materials, new methods of synthesis and surface functionalization, innovative hybrid nanostructures, as well as new sensing concepts and transduction principles.

This Special Issue strives to provide an extensive and thorough view on the current scientific and technological challenges in the science and technology of quantum-dot sensors. Special attention will be devoted to research advancements in materials, structures and detection principles which open up new sensing tools and application fields. Papers including but not limited to the following themes are expected:

New synthesis and functionalization methods of quantum dot nanocrystals for sensing tools; the design and development of quantum-dot-based sensing elements; new detection principles; plasmonics; chemical sensors; bio-sensors; electrochemical sensors; optical sensors; photodetectors; and image sensors.

I look forward to your participation in this Special Issue.

Dr. Gabriella Leo
Guest Editor

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. Chemosensors is an international peer-reviewed open access monthly 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 2000 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

  • quantum dots
  • nanocrystals
  • surface chemistry
  • functionalization
  • sensors
  • biosensors
  • chemical sensors
  • electrochemical sensors
  • plasmonic sensors
  • opto-chemical sensors
  • photodetectors
  • magnetic nanoparticle sensors

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Published Papers (3 papers)

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Research

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14 pages, 2928 KiB  
Article
Au Nanoparticles Decorated Graphene-Based Hybrid Nanocomposite for As(III) Electroanalytical Detection
by Valentina Pifferi, Anna Testolin, Chiara Ingrosso, Maria Lucia Curri, Ilaria Palchetti and Luigi Falciola
Chemosensors 2022, 10(2), 67; https://doi.org/10.3390/chemosensors10020067 - 8 Feb 2022
Cited by 11 | Viewed by 3515
Abstract
Electrochemical sensors integrating hybrid nanostructured platforms are a promising alternative to conventional detection techniques for addressing highly relevant challenges of heavy metal determination in the environment. Hybrid nanocomposites based on graphene derivatives and inorganic nanoparticles (NPs) are ideal candidates as active materials for [...] Read more.
Electrochemical sensors integrating hybrid nanostructured platforms are a promising alternative to conventional detection techniques for addressing highly relevant challenges of heavy metal determination in the environment. Hybrid nanocomposites based on graphene derivatives and inorganic nanoparticles (NPs) are ideal candidates as active materials for detecting heavy metals, as they merge the relevant physico-chemical properties of both the components, finally leading to a rapid and sensitive current response. In this work, a hybrid nanocomposite formed of reduced graphene oxide (RGO) sheets, surface functionalized by π-π interactions with 1-pyrene carboxylic acid (PCA), and decorated in situ by Au NPs, was synthesized by using a colloidal route. The hybrid nanocomposite was characterized by cyclic voltammetry and electrochemical impedance spectroscopy with respect to the corresponding single components, both bare and deposited as a layer-by-layer junction onto the electrode. The results demonstrated the high electrochemical activity of the hybrid nanocomposite with respect to the single components, highlighting the crucial role of the nanostructured surface morphology of the electrode and the PCA coupling agent at the NPs-RGO interphase in enhancing the nanocomposite electroactivity. Finally, the Au NP-decorated PCA-RGO sheets were tested by anodic stripping voltammetry of As(III) ion—a particularly relevant analyte among heavy metal ions—in order to assess the sensing ability of the nanocomposite material with respect to its single components. The nanocomposite has been found to present a sensitivity higher than that characterizing the bare components, with LODs complying with the directives established by the U.S. EPA and in line with those reported for state-of-the-art electrochemical sensors based on other Au-graphene nanocomposites. Full article
(This article belongs to the Special Issue Quantum-Dots Sensors)
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15 pages, 6462 KiB  
Article
Visible-Light-Driven Room Temperature NO2 Gas Sensor Based on Localized Surface Plasmon Resonance: The Case of Gold Nanoparticle Decorated Zinc Oxide Nanorods (ZnO NRs)
by Qomaruddin, Olga Casals, Hutomo Suryo Wasisto, Andreas Waag, Joan Daniel Prades and Cristian Fàbrega
Chemosensors 2022, 10(1), 28; https://doi.org/10.3390/chemosensors10010028 - 11 Jan 2022
Cited by 13 | Viewed by 4316
Abstract
In this work, nitrogen dioxide (NO2) gas sensors based on zinc oxide nanorods (ZnO NRs) decorated with gold nanoparticles (Au NPs) working under visible-light illumination with different wavelengths at room temperature are presented. The contribution of localized surface plasmon resonant (LSPR) [...] Read more.
In this work, nitrogen dioxide (NO2) gas sensors based on zinc oxide nanorods (ZnO NRs) decorated with gold nanoparticles (Au NPs) working under visible-light illumination with different wavelengths at room temperature are presented. The contribution of localized surface plasmon resonant (LSPR) by Au NPs attached to the ZnO NRs is demonstrated. According to our results, the presence of LSPR not only extends the functionality of ZnO NRs towards longer wavelengths (green light) but also increases the response at shorter wavelengths (blue light) by providing new inter-band gap energetic states. Finally, the sensing mechanism based on LSPR Au NPs is proposed. Full article
(This article belongs to the Special Issue Quantum-Dots Sensors)
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Review

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20 pages, 2436 KiB  
Review
Aptamer-Conjugated Quantum Dot Optical Biosensors: Strategies and Applications
by Dongmin Kim and Seungmin Yoo
Chemosensors 2021, 9(11), 318; https://doi.org/10.3390/chemosensors9110318 - 12 Nov 2021
Cited by 17 | Viewed by 4342
Abstract
Quantum dots (QDs) represent the promising new generation of luminophores owing to their size-, composition-, and surface-dependent tunable photoluminescence (PL) and photochemical stability. The development of various QD composites with high PL and good biocompatibility has facilitated the use of aptamer-functionalized QD biosensors [...] Read more.
Quantum dots (QDs) represent the promising new generation of luminophores owing to their size-, composition-, and surface-dependent tunable photoluminescence (PL) and photochemical stability. The development of various QD composites with high PL and good biocompatibility has facilitated the use of aptamer-functionalized QD biosensors for highly sensitive and specific detection of molecules in clinical and environmental settings. In addition to describing the recent advances in aptamer-based QD biosensor technology for the detection of diverse chemicals and biomolecules, this review provides recent examples of sensing strategies based on optical signal enhancement and quenching of QDs. It also discusses potential strategies for the development of biosensors to widen their practical applications across various scientific and technological fields. Full article
(This article belongs to the Special Issue Quantum-Dots Sensors)
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