Mechanically rollable photodetectors enabled by centimetre-scale 2D MoS₂ layer/TOCN composites

Abstract

Two-dimensional (2D) molybdenum disulfide (MoS2) layers are suitable for visible-to-near infrared photodetection owing to their tunable optical bandgaps. Also, their superior mechanical deformability enabled by extremely small thickness and van...

Low-Temperature Centimeter-Scale Growth of Layered 2D SnS for Piezoelectric Kirigami Devices

“…Figure h shows the UV–visible absorbance spectrum for 2D SnS layers directly grown on a glass substrate along with the corresponding optical microscopy image (inset). Figure i presents the corresponding Tauc plot of (α h ν) 1/2 vs h ν converted from the absorbance spectrum, where α is the optical absorption coefficient and h ν is the photon energy . The extrapolation of the Tauc plot reveals that the optical band gap energy of 2D SnS layers is in a range of ∼1.0–1.1 eV, which agrees well with previous studies. , The semiconducting characteristics of 2D SnS layers were further verified by variable-temperature electrical characterizations.…”

“…Wearable electronics that can convert mechanical energy into electrical energy have received increasing attention in a range of technologies, such as healthcare and medical applications. − In this regard, two-dimensional (2D) materials offer distinct advantages with their ability to maintain high structural integrity under excessive mechanical stimuli owing to their large strain limits. ,− Among a variety of atomically thin 2D materials, those with intrinsic piezoelectric properties are considered promising for energy-harvesting applications. − Particularly, group IV 2D monochalcogenides (MXs; where M = Sn or Ge and X = S or Se) have received significant attention due to the large in-plane piezoelectricity originating from their van der Waals (vdW) hinge-like layered structure. ,− While a large family of 2D monochalcogenides has been explored, tin monosulfide (SnS) 2D layers exhibit intriguing properties enabled by their structural anisotropy such as high piezoelectric coefficients as well as ferroelectricity-driven gating and synaptic characteristics . Despite these appealing structure–property aspects, the centimeter-scale chemical synthesis of morphologically homogeneous 2D SnS layers has been limited, hindering their practical applications .…”

Large-area vertically aligned 2D MoS2 layers on TEMPO-cellulose nanofibers for biodegradable transient gas sensors

“…Figure 2(a) shows a schematic illustration of the fabrication process of a VA-2D MoS 2 /TOCN gas sensor. The fabrication starts with the wafer-scale CVD growth of the VA-2D MoS 2 layers with a typical lateral dimension of ∼10 cm×2 cm on top of a SiO 2 /Si wafer [15,[45][46][47][48][49]. Mo film of a controlled thickness (∼6 nm) is deposited on a clean SiO 2 /Si wafer via electron beam evaporation followed by the CVD sulfurization reaction, which converts the Mo films into VA-2D MoS 2 layers, as previously demonstrated [18,50,51].…”

Nanomembrane-assembled nanophotonics and optoelectronics: from materials to applications

“…The characterization of the 3D rolled-up device shows that the photocurrent increases linearly to the light intensity, exhibiting good sensitivity. Figure 6(c)-(i) shows that MoS 2 nanomembranes are integrated on an optically transparent substrate to form a rolled-up photodetector [27]. It is demonstrated that the 3D rolled-up photodetector exhibits a faster response time and stability, as shown in figure 6(c)-(ii).…”

“…While for the material aspect, semiconductor materials of IV and III-V groups obtain high quality responses to light owing to their intrinsic properties [22][23][24][25]. 2D layered materials such as graphene and MoS 2 are also widely used due to their atomic thickness, flexibility, enhanced light-matter interactions, and the ability to form heterostructures bonded by van der Waals forces [26,27]. 3D assembly techniques based on nanomembranes made from above materials, including rolling, folding, buckling and pick-place methods, have already been used to prepare novel devices for nanophotonics and optoelectronics.…”