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Solid-State pH Sensors
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Solid-State pH Sensors

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

Deadline for manuscript submissions: closed (31 December 2018) | Viewed by 10119

Special Issue Editor

Prof. Dr. Kamal Alameh

E-Mail Website
Guest Editor
Electron Science Research Institute, Edith Cowan University, Joondalup, WA 6027, Australia
Interests: microphotonics; opto-VLSI; nanophotonics; plasmonics; photonics-based sensors; nano-bio; renewable energy; security and defense
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The accurate measurement of pH is crucial for numerous application areas, including pharmaceutical and chemical processing, food and beverage processing, manufacturing, environmental and ecological monitoring and medical diagnoses.

Over the last five years, miniaturized solid-state pH sensor structures, based on different technologies, have been reported, demonstrating attractive features, such as high-sensitivity, stability, and durability. The realization of such solid-state pH sensors opens the way for the development of cost-effective and viable pH sensors for various research and industrial applications.

This Special Issue aims to highlight advances in the design, development, characterization, and application of solid-state pH sensors. Topics include, but are not limited, to:

  • Advanced solid-state pH sensor structures
  • Metal oxide-based pH sensors
  • Ionophore-based Ion-Selective pH Electrodes (ISEs)
  • Conducting polymer-based pH sensors
  • pH-insensitive reference electrodes
  • Advanced pH sensor characterization techniques
  • pH sensor modeling and calibration

Prof. Dr. Kamal Alameh
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. 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

4327 KiB  
Article
Silicon Nanocrystals with pH-Sensitive Tunable Light Emission from Violet to Blue-Green
by Jing Wang, Junhong Guo and Jing Chen
Sensors 2017, 17(10), 2396; https://doi.org/10.3390/s17102396 - 20 Oct 2017
Cited by 7 | Viewed by 4669
Abstract
We fabricated a silicon nanocrystal (NC) suspension with visible, continuous, tunable light emission with pH sensitivity from violet to blue-green. Transmission electron microscopy (TEM) images and X-ray diffraction (XRD) pattern analysis exhibit the highly crystalline nanoparticles of silicon. Photoluminescence (PL) spectra and photoluminescence [...] Read more.
We fabricated a silicon nanocrystal (NC) suspension with visible, continuous, tunable light emission with pH sensitivity from violet to blue-green. Transmission electron microscopy (TEM) images and X-ray diffraction (XRD) pattern analysis exhibit the highly crystalline nanoparticles of silicon. Photoluminescence (PL) spectra and photoluminescence excitation (PLE) spectra at different pH values, such as 1, 3, 5, 7, 9, and 11, reveal the origins of light emission from the silicon NC suspension, which includes both the quantum confinement effect and surface bonding. The quantum confinement effect dominates the PL origins of silicon NCs, especially determining the tunability and the emission range of PL, while the surface bonding regulates the maximum peak center, full width at half maximum (FWHM), and offsets of PL peaks in response to the changing pH value. The peak fitting of PLE curves reveals one of the divided PLE peaks shifts towards a shorter wavelength when the pH value increases, which implies correspondence with the surface bonding between silicon NCs and hydrogen atoms or hydroxyl groups. The consequent detailed analysis of the PL spectra indicates that the surface bonding results in the transforming of the PL curves towards longer wavelengths with the increasing pH values, which is defined as the pH sensitivity of PL. These results suggest that the present silicon NCs with pH-sensitive tunable light emission could find promising potential applications as optical sources, bio-sensors, etc. Full article
(This article belongs to the Special Issue Solid-State pH Sensors)
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2247 KiB  
Article
RuO2 pH Sensor with Super-Glue-Inspired Reference Electrode
by Wade Lonsdale, Magdalena Wajrak and Kamal Alameh
Sensors 2017, 17(9), 2036; https://doi.org/10.3390/s17092036 - 06 Sep 2017
Cited by 18 | Viewed by 4674
Abstract
A pH-sensitive RuO2 electrode coated in a commercial cyanoacrylate adhesive typically exhibits very low pH sensitivity, and could be paired with a RuO2 working electrode as a differential type pH sensor. However, such sensors display poor performance in real sample matrices. [...] Read more.
A pH-sensitive RuO2 electrode coated in a commercial cyanoacrylate adhesive typically exhibits very low pH sensitivity, and could be paired with a RuO2 working electrode as a differential type pH sensor. However, such sensors display poor performance in real sample matrices. A pH sensor employing a RuO2 pH-sensitive working electrode and a SiO2-PVB junction-modified RuO2 reference electrode is developed as an alternative high-performance solution. This sensor exhibits a performance similar to that of a commercial glass pH sensor in some common sample matrices, particularly, an excellent pH sensitivity of 55.7 mV/pH, a hysteresis as low as 2.7 mV, and a drift below 2.2 mV/h. The developed sensor structure opens the way towards the development of a simple, cost effective, and robust pH sensor for pH analysis in various sample matrices. Full article
(This article belongs to the Special Issue Solid-State pH Sensors)
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