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Dear Colleagues,

The isolation of graphene 15 years ago, and of a myriad of related layered two-dimensional materials in more recent years, sparked a revolution in many areas of science, ranging from material science to semiconductor physics. The outstanding optical, electrical, and mechanical properties of these materials combined with the absence of dangling bonds in their surface made the fabrication and study of novel (opto)electronic devices with exceptional performances possible. Van der Waals heterostructures have emerged as one of the most interesting structures that can be created with 2D materials, allowing researchers to access novel phenomena such as interlayer excitons. Moreover, the control over the moiré superlattices in van der Waals heterostructures allowed the realization of nontrivial superconductivity in magic angles twisted bilayer graphene or the unconventional fractional quantum Hall effect.

The aim of this Special Issue entitled “2D Materials and Their Heterostructures and Superlattices” is to offer the latest cutting-edge research and development in the field of van der Waals heterostructures and 2D-materials-based superlattices. Both experimental and theoretical articles will be published in this Special Issue, focusing on the state-of-the-art of recent research on 2D materials, van der Waals heterostructures and 2D superlattices, with a special focus on phenomena such as interlayer excitons and twistronics.

Dr. Andres Castellanos-Gomez
Dr. Riccardo Frisenda
Guest Editors

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Keywords

2D chalcogenides: WSe2, MoTe2, TaS2, GaSe, InSe, Sb2Te3, Bi2Se3, etc.
Monoelement 2D materials: black phosphorous, silicene, germanene, etc.
2D oxides, carbides, and nitrides
Graphene and its analogs (graphene oxide, fluorographene, etc.)
Van der Waals heterostructures, 2D superlattices, moiré patterns, interlayer phenomena, interlayer excitons
2D advanced devices and applications
Optoelectronics, twistronics

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12 pages, 4378 KiB

Open AccessEditor’s ChoiceArticle

Eco-Friendly Disposable WS₂ Paper Sensor for Sub-ppm NO₂ Detection at Room Temperature

by Daniel Matatagui, Carlos Cruz, Felix Carrascoso, Abdullah M. Al-Enizi, Ayman Nafady, Andres Castellanos-Gomez and María del Carmen Horrillo

Nanomaterials 2022, 12(7), 1213; https://doi.org/10.3390/nano12071213 - 05 Apr 2022

Cited by 13 | Viewed by 2700

Abstract

We developed inexpensive and disposable gas sensors with a low environmental footprint. This approach is based on a biodegradable substrate, paper, and features safe and nontoxic electronic materials. We show that abrasion-induced deposited WS₂ nanoplatelets on paper can be employed as a successful sensing layer to develop high-sensitivity and selective sensors, which operate even at room temperature. Its performance is investigated, at room temperature, against NO₂ exposure, finding that the electrical resistance of the device drops dramatically upon NO₂ adsorption, decreasing by ~42% (~31% half a year later) for 0.8 ppm concentration, and establishing a detection limit around~2 ppb (~3 ppb half a year later). The sensor is highly selective towards NO₂ gas with respect to the interferents NH₃ and CO, whose responses were only 1.8% (obtained for 30 ppm) and 1.5% (obtained for 8 ppm), respectively. Interestingly, an improved response of the developed sensor under humid conditions was observed (tested for 25% relative humidity at 23 °C). The high-performance, in conjunction with its small dimensions, low cost, operation at room temperature, and the possibility of using it as a portable system, makes this sensor a promising candidate for continuous monitoring of NO₂ on-site. Full article

(This article belongs to the Special Issue 2D Materials and Their Heterostructures and Superlattices II)

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