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Nanomaterials: Recent Advances in Photocatalysis and Sensing
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Nanomaterials: Recent Advances in Photocatalysis and Sensing

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Nanomaterials and Nanotechnology".

Deadline for manuscript submissions: 20 September 2025 | Viewed by 477

Special Issue Editors

Dr. Kandasamy Sasikumar

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Guest Editor
Department of Physics, Gachon University, Seongnam-si 13120, Gyeonggi-do, Republic of Korea
Interests: environmental pollutants; quantum dots; metal-organic frameworks
Dr. Ramar Rajamanikandan

E-Mail Website
Guest Editor
Department of Physics, Gachon University, Seongnam-si 13120, Gyeonggi-do, Republic of Korea
Interests: biomarkers; fluorescence sensing; colorimetric sensing
Dr. Heongkyu Ju

E-Mail Website
Guest Editor
Department of Physics, Gachon University, Seongnam-si 13120, Gyeonggi-do, Republic of Korea
Interests: plasmonics; environmental pollutants; fluorescent nanoprobes; nanomaterials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the rapid development of industrialization, water pollution has become a serious threat to both humanity and environmental sustainability. Hence, it is crucial to remove toxic contaminants from environmental water bodies. Nanomaterials have opened up broad avenues in various cutting-edge applications due to their unique and tailorable physicochemical properties at the nanoscale. The size-dependent quantum confinement effects in nanomaterials significantly alter the behavior of electrons and holes, making them distinguishable from their bulk counterparts. Semiconductor quantum dots, carbon dots, MXene quantum dots, metal nanoparticles, and metal nanoclusters, with their exceptional optical properties, serve as attractive optical labels in various optical chemo-/biosensors.

This Special Issue aims to cover the recent progress attained on advanced nanomaterials for environmental remediation and sensing. We welcome original research articles and review reports on nanomaterial-related topics of interest that find applications in the following areas:

  • Pollutant degradation;
  • Hydrogen/oxygen evolution;
  • Carbon dioxide reduction;
  • Nitrogen reduction;
  • Quantum dot-based sensing;
  • Diagnostics or monitoring of environmental pollutants, pathogens, and biomarkers with fluorescent nanoprobes.

We look forward to receiving your contributions.

Dr. Kandasamy Sasikumar
Dr. Ramar Rajamanikandan
Dr. Heongkyu Ju
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. Materials 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

  • functional nanomaterials
  • quantum dots
  • metal–organic frameworks
  • plasmonic nanostructures
  • environmental remediation
  • fluorescent nanoprobes
  • colorimetric sensing

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Published Papers (1 paper)

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Research

17 pages, 4065 KiB  
Article
Smartphone-Assisted Plasmonic Nanosensor for Visual and Specific Sensing of Toxic Cyanide Ions by β−Cyclodextrin Templated Gold-Rich/Silver Bimetallic Alloy Nanoparticles
by Nguyen Nam Phuong Truong, Ramar Rajamanikandan, Kandasamy Sasikumar and Heongkyu Ju
Materials 2025, 18(7), 1604; https://doi.org/10.3390/ma18071604 - 2 Apr 2025
Viewed by 350
Abstract
As cyanide ion (CN−), an ecologically harmful pollutant, has received incessant attention with growing industrialization on a global scale, the capability of on-site monitoring of CN− contamination becomes increasingly crucial. In this work, we have fabricated a simplistic plasmonic-sensing platform [...] Read more.
As cyanide ion (CN−), an ecologically harmful pollutant, has received incessant attention with growing industrialization on a global scale, the capability of on-site monitoring of CN− contamination becomes increasingly crucial. In this work, we have fabricated a simplistic plasmonic-sensing platform for CN−, which can be combined with the human naked eye for visual monitoring. The main sensor part consisted of β-Cyclodextrin (β−CD)-decorated gold-rich silver bimetallic alloy nanoparticles (β−CD-Ag/Au-rich alloy NPs), while a sensing analysis was performed by a spectrophotometer or smartphone, where optical data gathered by its camera were analyzed by RGB color sensing. Upon the introduction of various CN− quantities into β−CD-Ag/Au-rich alloy NPs, the spectral peak of the surface plasmon resonance (SPR) shifted from 488 nm to 496 nm. This redshift indicated a strong etching reaction between alloy NPs and CN−, demonstrating a ultrahigh detection sensitivity, i.e., a limit of detection (LOD) of 0.24 nM. During the formation of metal-cyano complexes in the CN−-induced etching response of β−CD-Ag/Au-rich alloy NPs, we observed a naked-eye discernible color change from brownish-red to colorless, allowing for naked-eye monitoring. The smartphone could also analyze the colorimetric response for such an etching process via RGB color sensing, demonstrating a LOD of 1.35 nM, being still less than the maximum concentration (1.91 nM) in drinking water, which is allowable by the World Health Organization (WHO). The straightforwardness and very high sensitivity of the proposed technique for CN− detection using alloy nanoparticles with a smartphone may hold promise for simplistic, affordable in-field examinations of CN⁻ in water. Full article
(This article belongs to the Special Issue Nanomaterials: Recent Advances in Photocatalysis and Sensing)
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