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Chemosensors
Special Issues
Fluorescence and Raman Spectroscopy and Nanosensors in Analytical Chemistry
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Fluorescence and Raman Spectroscopy and Nanosensors in Analytical Chemistry

A special issue of Chemosensors (ISSN 2227-9040). This special issue belongs to the section "Analytical Methods, Instrumentation and Miniaturization".

Deadline for manuscript submissions: closed (15 February 2024) | Viewed by 3346

Special Issue Editor

Prof. Dr. Mohammad E. Khosroshahi

E-Mail Website1 Website2
Guest Editor
1. Nanobiophotonics & Biomedical Research Laboratory, M.I.S. Electronics Inc., Richmond Hill, ON L4B 1B4, Canada
2. Institute for Advanced Non-Destructive & Diagnostic Technologies (IANDIT), University of Toronto, Toronto, ON M5S 3G8, Canada
Interests: nanobiophotonics; optical molecular spectroscopy; nanobiosensors; nanomedicine; targeted detection of cancer biomarkers; guided bioimaging; targeted drug delivery; selective photothermal therapy; biological chaos and cancer thermodynamics

Special Issue Information

Dear Colleagues,

Recent advances in ultrasensitive instrumentation have enabled scientists to detect, identify, and study the dynamics of the single molecules applied in Analytical chemistry, molecular biology, and nanostructured materials. Analytical chemistry is the science of obtaining, processing, and communicating information about the composition and structure of matter. It exploits spectroscopy in one form or another to provide a range of tools for the identification (qualitative analysis) and measurement (quantitative analysis) of materials at different levels. It is crucial to appreciate that matter only reveals its structural properties to the observer at the scale at which it is studied, and the information obtained is dependent on the analysis method. Therefore, during this process, how much information one can obtain depends on the intrinsic nature of the instrument, the limitation and strength of the technique employed, and the time scale (i.e., the time the structure is excited and the time during which the information is registered). Among various techniques, fluorescence spectroscopy (FS) at the electronic level and Raman spectroscopy (RS) at the vibrational level can provide unique spectral fingerprints to detect, characterize and identify chemical compositions, materials, and activities, and have played a key role in meeting the above demands.

Fortunately, some of the weaknesses of each technique have been resolved by exploiting the cutting-edge technology (i.e., nanotechnology together with advanced nanomaterials). This has resulted in tremendous improvement in the field of Analytical chemistry, with extensive applications in chemistry, biochemistry, and biomedical engineering, especially with regard to non-invasive and non-destructive cancer diagnosis. Recently, the advanced research has accomplished significant improvements in this area using various biosensors, particularly nanobiosensors. The analysis of biochemical structure (i.e., the analyte) and study of the interaction mechanism of light energy with matter via spectroscopic techniques is now well established as an inevitable practical tool. 

Within this context, we propose this Special Issue to address the recent advances in Analytical chemistry instrumentation. The Special Issue is particularly interested in the use of different nanomaterials in plasmon-enhanced fluorescence spectroscopy (PEFS), fluorescence correlation spectroscopy (FCS), surface-enhanced Raman spectroscopy (SERS) and its various forms, single-molecule probing, hyperspectral imaging (HSI), and their applications.

Prof. Dr. Mohammad E. Khosroshahi
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 2700 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

  • fluorescence spectroscopy (FS)
  • laser-induced fluorescence spectroscopy (LIFS)
  • plasmon-enhanced fluorescence spectroscopy (PEFS)
  • fluorescence correlation spectroscopy (FCS)
  • Raman spectroscopy (RS)
  • surface-enhanced Raman spectroscopy (SERS)
  • spatially offset Raman spectroscopy (SORS)
  • surface-enhanced spatially offset resonance Raman spectroscopy (SESORRS)
  • single molecule detection
  • hyperspectral imaging (HSI)
  • industrial and biomedical diagnostic applications

Published Papers (2 papers)

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11 pages, 5451 KiB  
Article
Semiconductor Heterojunction-AgNPs Mediated Surface-Enhanced Raman Spectroscopy (SERS) Sensor for Portable Miniaturized Detection Platform
by Chenyu Wang, Xiaoyi Shi, Zhiyong Bao, Maofeng Zhang, Yonghui Shen and Yucheng Wu
Chemosensors 2023, 11(9), 490; https://doi.org/10.3390/chemosensors11090490 - 4 Sep 2023
Viewed by 1259
Abstract
Micro/nanoplastic pollution in the water environment has received great attention worldwide. The rapid identification and analysis of micro/nanoplastics are crucial steps for monitoring animal safety and protecting human health. Herein, we developed a novel surface-enhanced Raman spectroscopy (SERS) sensor based on Co3 [...] Read more.
Micro/nanoplastic pollution in the water environment has received great attention worldwide. The rapid identification and analysis of micro/nanoplastics are crucial steps for monitoring animal safety and protecting human health. Herein, we developed a novel surface-enhanced Raman spectroscopy (SERS) sensor based on Co3O4/Co3S4/AgNPs array substrate for the detection and analysis of micro/nanoplastics. The semiconductor heterojunction-induced charge transfer, enhanced together with the electromagnetic enhancement of plasmon AgNPs, endow the sensor with high sensitivity, thus achieving exceptional analytical and detection capability for polystyrene (PS) nanospheres of different sizes ranging from 1 µm to 1 nm. The limits of detection (LOD) for PS nanospheres (size of 1 µm and 800 nm) was as low as 25 µg/mL, even with a portable Raman spectrometer. Additionally, the periodic Co3O4/Co3S4/AgNPs array generated high repeatability of Raman signals with relative standard deviation (RSD) values less than 7.6%. As proof of this concept, we further demonstrated the simulation detection of PS in actual water samples. We measured the SERS spectra of the different sizes and concentrations of PS spiked in lake water and city water. The results showed that the sensing platform realized trace detection of PS nanospheres in lake water with a detection limit of 14 µg/mL, and a quantitative detection of PS with linear relationship (R2 = 0.962). This SERS sensor has demonstrated fast analysis of PS nanospheres, which can provide a solid basis for the qualitative and quantitative detection of various micro/nanoplastics in the real water environments. Full article
(This article belongs to the Special Issue Fluorescence and Raman Spectroscopy and Nanosensors in Analytical Chemistry)
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14 pages, 2902 KiB  
Article
Remote Measurements of Tear Electrolyte Concentrations on Both Sides of an Inserted Contact Lens
by Joseph R. Lakowicz, Ramachandram Badugu, Kundan Sivashanmugan and Albert Reece
Chemosensors 2023, 11(8), 463; https://doi.org/10.3390/chemosensors11080463 - 17 Aug 2023
Viewed by 1649
Abstract
In this paper, a method is described to perform ion concentration measurements on both sides of an inserted contact lens, without physical contact with the eye or the contact lens. The outer surface of an eye is covered with a tear film that [...] Read more.
In this paper, a method is described to perform ion concentration measurements on both sides of an inserted contact lens, without physical contact with the eye or the contact lens. The outer surface of an eye is covered with a tear film that has multiple layers. The central aqueous layer contains electrolytes and proteins. When a contact lens is inserted, it becomes localized in the central layer, which creates two layers known as the pre-lens tear film (PLTF) and the post-lens tear film (PoLTF). The PoLTF is in direct contact with the sensitive corneal epithelial cells which control electrolyte concentrations in tears. It is difficult to measure the overall electrolyte concentration in tears because of the small 7 μL volume of bulk tears. No methods are known, and no method has been proposed, to selectively measure the concentrations of electrolytes in the smaller volumes of the PLTF and the PoLTF. In this paper, we demonstrate the ability to localize fluorophores on each side of a contact lens without probe mixing or diffusion across the lens. We measured the concentration of sodium in the region of the PoLTF using a sodium-sensitive fluorophore positioned on the inner surface of a contact lens. The fluorescence measurements do not require physical contact and are mostly independent of eye motion and fluorophore concentration. The method is generic and can be combined with ion-sensitive fluorophores for the other electrolytes in tears. Instrumentation for non-contact measurements is likely to be inexpensive with modern opto-electronic devices. We expect these lenses to be used for measurements of other ions in the PLTF and the PoLTF, and thus become useful for both research and in the diagnosis of infections, keratitis and biomarkers for diseases. Full article
(This article belongs to the Special Issue Fluorescence and Raman Spectroscopy and Nanosensors in Analytical Chemistry)
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