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2D Materials-Based Sensors and Nanoscale Devices

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

Deadline for manuscript submissions: closed (30 May 2023) | Viewed by 3818

Special Issue Editor


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Guest Editor
Nanoscale Electronic Materials and Devices Laboratory, Faculty of Materials Science and Engineering, Technion – Israel Institute of Technology, Haifa 3200003, Israel
Interests: 2D materials; van der Waal’s heterostructures; optoelectronic devices; (opto-)neuromorphic devices; nanoscale fabrications; electro-optic RAM

Special Issue Information

Dear Colleagues,

Over the past decade, a series of two-dimensional (2D)-layered materials have been successfully synthesized with several intriguing electrical, physical and chemical properties and used those for multifunctional sensory applications (such as optical sensors, chemical sensors, gas sensors, mechanical sensors, biological sensors etc.). Subsequenly, the nanoscale sensor based on 2D materials is rapidly gaining worldwide attention, aiming towards industrial-scale real-time device applications. Moreover, the extremely high surface area and existence of surface defects in 2D layers makes them promising and compatible for all-type sensor applications.

This Special Issue is focused on 2D materials-based nanoscale sensor devices (including optical, chemical, biological and mechanical sensors). Owing to the continuous progress in the synthesis and engineering of 2D materials, a varity of novel functionalities can be achievable either by creating heterostructures with various nanometerials or doping with foreign moleclues, which can offer extra degree of tunabilty and selectivity in sensor’s performances. Additionally, the surface functionalization is another route to tailor the devices’ properties and make them respond selectively towards a particular type of inputs with significantly higher sensitivity. Furthermore, the flexible and transparent nature of 2D materials makes them a strong contender for next-generation wearble bio-electronic devices. The Editorial Board of the journal Sensors and myself are very pleased to announce this Special Issue and are looking forward to your contribution.

Dr. Subhrajit Mukherjee
Guest Editor

Manuscript Submission Information

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Keywords

  • optical sensor
  • chemical sensor
  • gas sensor
  • mechanical sensor
  • biological sensor
  • detector
  • pizeoelectric device
  • molecular detector

Published Papers (2 papers)

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Research

18 pages, 3703 KiB  
Article
A DFT Study of Phosphate Ion Adsorption on Graphene Nanodots: Implications for Sensing
by Ivan Shtepliuk
Sensors 2023, 23(12), 5631; https://doi.org/10.3390/s23125631 - 16 Jun 2023
Cited by 3 | Viewed by 1168
Abstract
The optical properties of graphene nanodots (GND) and their interaction with phosphate ions have been investigated to explore their potential for optical sensing applications. The absorption spectra of pristine GND and modified GND systems were analyzed using time-dependent density functional theory (TD-DFT) calculation [...] Read more.
The optical properties of graphene nanodots (GND) and their interaction with phosphate ions have been investigated to explore their potential for optical sensing applications. The absorption spectra of pristine GND and modified GND systems were analyzed using time-dependent density functional theory (TD-DFT) calculation investigations. The results revealed that the size of adsorbed phosphate ions on GND surfaces correlated with the energy gap of the GND systems, leading to significant modifications in their absorption spectra. The introduction of vacancies and metal dopants in GND systems resulted in variations in the absorption bands and shifts in their wavelengths. Moreover, the absorption spectra of GND systems were further altered upon the adsorption of phosphate ions. These findings provide valuable insights into the optical behavior of GND and highlight their potential for the development of sensitive and selective optical sensors for phosphate detection. Full article
(This article belongs to the Special Issue 2D Materials-Based Sensors and Nanoscale Devices)
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8 pages, 1822 KiB  
Communication
Improvement of Visible Photodetection of Chemical Vapor Deposition-Grown MoS2 Devices via Graphene/Au Contacts
by Yeongsik Hwa and Sang-Soo Chee
Sensors 2022, 22(24), 9687; https://doi.org/10.3390/s22249687 - 10 Dec 2022
Viewed by 1796
Abstract
Two-dimensional (2D) molybdenum disulfide (MoS2) is a promising material for constructing high-performance visible photosensor arrays because of its high mobility and scale-up process. These distinct properties enable the construction of practical optoelectrical sensor arrays. However, contact engineering for MoS2 films [...] Read more.
Two-dimensional (2D) molybdenum disulfide (MoS2) is a promising material for constructing high-performance visible photosensor arrays because of its high mobility and scale-up process. These distinct properties enable the construction of practical optoelectrical sensor arrays. However, contact engineering for MoS2 films is not still optimized. In this work, we inserted a graphene interlayer between the MoS2 films and Au contacts (graphene/Au) via the wet-transfer method to boost the device performance. Using graphene/Au contacts, outstanding electrical properties, namely field-effect mobility of 12.06 cm2/V∙s, on/off current ratio of 1.0 × 107, and responsivity of 610 A/W under illumination at 640 nm, were achieved. These favorable results were from the Fermi-level depinning effect induced by the graphene interlayer. Our results may help to construct large-area photonic sensor arrays based on 2D materials. Full article
(This article belongs to the Special Issue 2D Materials-Based Sensors and Nanoscale Devices)
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