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Innovative Sensor Devices for the Environmental Monitoring
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Innovative Sensor Devices for the Environmental Monitoring

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

Deadline for manuscript submissions: closed (31 July 2021) | Viewed by 8799

Special Issue Editors

Dr. Ivo Allegrini

E-Mail Website
Guest Editor
Envint Srl, Via Paradiso 65a, Montopoli di Sabina, 02434 Rieti, Italy
Interests: air pollution and environmental monitoring
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Federica Valentini

E-Mail Website
Guest Editor
Department of Sciences and Chemical Technologies, University of Rome Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy
Interests: green chemical synthesis; nanomaterials; nanotechnologies; template synthesis in essential oils; functionalized nanoparticles in essential oils; cultural heritage applications; drug delivery; drug discovery; bio-compatible nanocomposite materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Considering the pollution events affecting urban areas and remote and rural zones, it has become necessary to develop new sensitive and highly selective devices able to monitor aggressive pollutants. Chemical pollutants are both gaseous species and particulate matter. The former are emitted from primary sources and then undergo secondary transformations. Monitoring of both primary and secondary pollutants implies the use of analytical devices, such as samplers and sensors, which need to be specific, highly selective, miniaturizable, low-cost, easy to handle, and equipped of wireless connection for acquiring the signal from “remote” systems. To achieve all these analytical performances, high technology (recently also Electroanalytical Chemistry) combined with innovative functionalized nanomaterials have been developed on a large scale, especially for the control of large areas. In this way, it is possible to acquire a more representative knowledge of photochemical smog phenomena, responsible for the release of several precursors species. Moreover, portable devices can be equipped with a regeneration system to provide a long time autonomy for “in situ” applications. Furthermore, the possibility of integrating sensors in circuits having neuronal networks for signal processing, having also ICT and IoT programs, represents a future challenge in the field of environmental digital monitoring and air quality control.

Dr. Ivo Allegrini
Prof. Dr. Federica Valentini
Guest Editors

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Keywords

  • Environmental pollution
  • Gaseous pollutants
  • Particulate matter
  • Sensors
  • Samplers
  • Miniaturizable devices
  • Wireless connection
  • Regenerated sensors
  • ensitivity and selectivity

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Published Papers (2 papers)

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Research

15 pages, 5044 KiB  
Article
Hierarchical Porous Carbon Electrodes with Sponge-Like Edge Structures for the Sensitive Electrochemical Detection of Heavy Metals
by Jongmin Lee, Soosung Kim and Heungjoo Shin
Sensors 2021, 21(4), 1346; https://doi.org/10.3390/s21041346 - 14 Feb 2021
Cited by 19 | Viewed by 3182
Abstract
This article presents the development of a highly sensitive electrochemical heavy metal sensor based on hierarchical porous carbon electrodes with sponge-like edge structures. Micrometer-scale hierarchical nanoporous carbon electrodes were fabricated at a wafer-scale using cost-effective batch microfabrication technologies, including the carbon microelectromechanical systems [...] Read more.
This article presents the development of a highly sensitive electrochemical heavy metal sensor based on hierarchical porous carbon electrodes with sponge-like edge structures. Micrometer-scale hierarchical nanoporous carbon electrodes were fabricated at a wafer-scale using cost-effective batch microfabrication technologies, including the carbon microelectromechanical systems technology and oxygen plasma etching. The sponge-like hierarchical porous structure and sub-micrometer edges of the nanoporous carbon electrodes facilitate fast electron transfer rate and large active sites, leading to the efficient formation of dense heavy metal alloy particles of small sizes during the preconcentration step. This enhanced the peak current response during the square wave anodic stripping voltammetry, enabling the detection of Cd(II) and Pb(II) at concentrations as low as 0.41 and 0.7 μg L−1, respectively, with high sensitivity per unit sensing area (Cd: 109.45 nA μg−1 L mm−2, Pb: 100.37 nA μg−1 L mm−2). Full article
(This article belongs to the Special Issue Innovative Sensor Devices for the Environmental Monitoring)
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16 pages, 4468 KiB  
Article
Performance of CuAl-LDH/Gr Nanocomposite-Based Electrochemical Sensor with Regard to Trace Glyphosate Detection in Water
by Chuxuan Zhang, Xinqiang Liang, Yuanyuan Lu, Hua Li and Xiangyang Xu
Sensors 2020, 20(15), 4146; https://doi.org/10.3390/s20154146 - 25 Jul 2020
Cited by 39 | Viewed by 4863
Abstract
Glyphosate, which has been widely reported to be a toxic pollutant, is often present at trace amounts in the environment. In this study, a novel copper-aluminum metal hydroxide doped graphene nanoprobe (labeled as CuAl–LDH/Gr NC) was first developed to construct a non-enzymatic electrochemical [...] Read more.
Glyphosate, which has been widely reported to be a toxic pollutant, is often present at trace amounts in the environment. In this study, a novel copper-aluminum metal hydroxide doped graphene nanoprobe (labeled as CuAl–LDH/Gr NC) was first developed to construct a non-enzymatic electrochemical sensor for detection trace glyphosate. The characterization results showed that the synthesized CuAl–LDH had a high-crystallinity flowered structure, abundant metallic bands and an intercalated functional group. After mixed with Gr, the nanocomposites provided a larger surface area and better conductivity. The as-prepared CuAl–LDH/Gr NC dramatically improved the enrichment capability for glyphosate to realize the stripping voltammetry detection. The logarithmic linear detection range of the sensor was found to be 2.96 × 10−9–1.18 × 10−6 mol L−1 with the detection limit of 1 × 10−9 mol L−1 with excellent repeatability, good stability and anti-interference ability. Further, the sensor achieved satisfactory recovery rates in spiked surface water, ranging from 97.64% to 108.08%, demonstrating great accuracy and practicality. Full article
(This article belongs to the Special Issue Innovative Sensor Devices for the Environmental Monitoring)
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