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Micromachines
Special Issues
Nanomaterial/Composite-Based Electrochemical (Bio)Sensing Microsystem
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Nanomaterial/Composite-Based Electrochemical (Bio)Sensing Microsystem

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "B：Biology and Biomedicine".

Deadline for manuscript submissions: 30 September 2025 | Viewed by 675

Special Issue Editor

Dr. Sadia Ameen

E-Mail Website
Guest Editor
Advanced Materials and Devices Laboratory, Department of Bio-Convergence Science, Advance Science Campus, Jeonbuk National University, Jeongeup 56212, Republic of Korea
Interests: synthesis of nanomaterials; solar cells; electrochemical sensors; catalyst; optoelectronic devices
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Electrochemical (bio)sensing platforms have gained significant attention due to their sensitivity, selectivity, and rapid response time. The utilization of nanomaterials and composites as electrode materials has further enhanced the capabilities of these platforms, making them more efficient and versatile for various applications, including medical diagnostics, environmental monitoring, and food safety. The high surface area of nanomaterials as electrode materials, resulting in increased sensitivity, shows high selectivity towards target analytes, and the excellent electrical conductivity of nanomaterials enables fast electron transfer, which contributes to a quicker response time in detecting analytes. We would like to draw your attention to our upcoming Special Issue on “Nanomaterial/Composite-Based Electrochemical (Bio)sensing Platform”, which will be published in Micromachines (ISSN 2072-666X, IF-3.4, https://www.mdpi.com/journal/micromachines), an international peer-reviewed open access journal by MDPI. The purpose of this Special Issue is to solicit original contributions and publish recent advances in nanomaterial/composite-based electrochemical (bio)sensors.

For further reading, please follow the link to the Special Issue Website at Micromachines. The deadline for this submission is 28 February 2025. However, we encourage you to submit your work as soon as it is ready. Please note that all submitted articles will undergo peer review.

In case of any inquiries or if you need any additional information, please do not hesitate to contact us at [email protected]. We look forward to your contributions.

Dr. Sadia Ameen
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. Micromachines 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 2100 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

  • electrochemical sensor
  • nanomaterials
  • biomaterials
  • electrodes
  • electrical devices
  • composites
  • photoelectrochemical systems

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Published Papers (1 paper)

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Research

14 pages, 9640 KiB  
Article
Highly Dense TiO2 Nanorods as Potential Electrode Material for Electrochemical Detection of Multiple Heavy Metal Ions in Aqueous Medium
by Sadia Ameen
Micromachines 2025, 16(3), 275; https://doi.org/10.3390/mi16030275 - 27 Feb 2025
Viewed by 179
Abstract
This study describes the direct deposition of extremely dense TiO2 nanorods (NRs) on an ITO substrate for the improved detection of heavy metal ions (HMIs). A facile hydrothermal method was employed to synthesize TiO2 NRs on the ITO substrate at ~130 [...] Read more.
This study describes the direct deposition of extremely dense TiO2 nanorods (NRs) on an ITO substrate for the improved detection of heavy metal ions (HMIs). A facile hydrothermal method was employed to synthesize TiO2 NRs on the ITO substrate at ~130 °C. Synthesized TiO2 NRs were analyzed for morphological, structural, and electrochemical properties. As an electrode material, TiO2 NRs were used for the simultaneous detection of three HMIs (i.e., Cr3+, Cu2+, and Hg2+), which showed a remarkably high sensitivity of ~92.2 µA.mM−1.cm−2 for the Cu2+ ion. Relatively low sensitivities of ~15.6 µA.mM−1.cm−2 and ~19.67 µA.mM−1.cm−2 were recorded for the Cr3+ and Hg2+ ions, respectively. The fabricated TiO2 NR-based HMI sensor showed an effective dynamic linear detection range with low LOD values of ~21.7 mM, 37 mM, and ~ 28.5 mM for Cr3+, Cu2+, and Hg2+, respectively. The TiO2 NR-based HMI sensor exhibited efficient charge transfer over the electrode toward the trace detection of Cr3+, Cu2+, and Hg2+. Moreover, the reliability of the TiO2 NR-based HMI sensor was assessed, which exhibited a promising stability of 30 days. The obtained results indicate that TiO2 NRs grown on an ITO substrate are a promising electrode material for detecting hazardous Cr3+, Cu2+, and Hg2+ and might eventually be commercialized in the near future. Full article
(This article belongs to the Special Issue Nanomaterial/Composite-Based Electrochemical (Bio)Sensing Microsystem)
►▼ Show Figures

Figure 1

Figure 1
<p>FESEM images of TiO<sub>2</sub> NR thin film at low (<b>a</b>,<b>b</b>) and high (<b>c</b>,<b>d</b>) resolution. Insets show histograms of the length and diameter of TiO<sub>2</sub> NRs.</p> Full article ">Figure 2
<p>Low-resolution TEM (<b>a</b>) and HRTEM (<b>b</b>) images of TiO<sub>2</sub> NR thin film.</p> Full article ">Figure 3
<p>XRD (<b>a</b>), UV-vis absorption spectrum (<b>b</b>), and its corresponding Tauc plot (<b>c</b>) of TiO<sub>2</sub> NR thin film.</p> Full article ">Figure 4
<p>FTIR (<b>a</b>) and Raman spectra (<b>b</b>) of TiO<sub>2</sub> NR thin film.</p> Full article ">Figure 5
<p>XPS survey (<b>a</b>), Ti 2p (<b>b</b>), and resolved O 1s (<b>c</b>) of TiO<sub>2</sub> NR thin film.</p> Full article ">Figure 6
<p>CV measurements of TiO<sub>2</sub> NR electrode (<b>a</b>) in pristine phosphate buffer solution (PBS, pH = 7.0) electrolyte (<b>a</b>), and in 10 mM of Cr<sup>3+</sup> (<b>b</b>), Cu<sup>2+</sup> (<b>c</b>), and Hg<sup>2+</sup> (<b>d</b>) in PBS electrolyte.</p> Full article ">Figure 7
<p>(<b>a</b>) CV plots and (<b>b</b>) their corresponding calibrated plot of TiO<sub>2</sub> NR electrode in PBS electrolyte with Cr<sup>3+</sup> in varied concentrations from 10 to 200 mM.</p> Full article ">Figure 8
<p>(<b>a</b>) CV plots and (<b>b</b>) their corresponding calibrated plot of TiO<sub>2</sub> NR electrode in PBS electrolyte with Hg<sup>2+</sup> in varied concentrations from 10 to 200 mM.</p> Full article ">Figure 9
<p>(<b>a</b>) CV plots and (<b>b</b>) their corresponding calibrated plot of TiO<sub>2</sub> NR electrode in PBS electrolyte with Cu<sup>2+</sup> in varied concentrations from 10 to 200 mM.</p> Full article ">Figure 10
<p>(<b>a</b>) An illustration of a possible sensing mechanism of the TiO<sub>2</sub> NRs electrode for HMIs, (<b>b</b>) a reliability test of the TiO<sub>2</sub> NR-modified HMI sensor (for Cr<sup>3+</sup>, Cu<sup>2+</sup>, and Hg<sup>2+</sup>), and (<b>c</b>) histograms exhibiting the sensitivity of the TiO<sub>2</sub> NR electrode versus days.</p> Full article ">
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