Flexible, environmentally-acceptable and long-durable-energy-efficient novel WS <sub>2</sub>–polyacrylamide MOFs for high-performance photodetectors

There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

Abstract

In this work, two-dimensional WS ₂–polyacrylamide metal–organic frameworks (MOFs) are prepared via an energy-efficient solvent-free frontal polymerization method and further used as a biocompatible, flexible, and low threshold high-performance photodetection. For fabricating biocompatible and flexible photodetector devices, these MOFs are coated on a normal paper substrate and carbon nanotubes are used as the electrodes. Scanning and tunneling electron microscopy (SEM and TEM) images exhibit the nanosheet-like structure and clear incorporation of WS ₂ nanosheets in a polyacrylamide matrix. X-ray photoelectron spectroscopy (XPS) analysis shows the peaks of W 5p _3/2, W 4f _3/2, and W 4f _7/2 at the binding energies of 38.48, 34.98, and 32.88 eV, confirming the presence of W with a valence of +4. Further investigations on MOFs were carried out through UV-Visible spectroscopy, Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), and differential scanning calorimetric (DSC) analysis. This environmentally acceptable device shows the very appreciable responsivity and detectivity of 1.3742 A W ⁻¹ and 1.5268 × 10 ¹² Jones, respectively. The highest external quantum efficiency (EQE) and linear dynamic range (LDR) were found to be 465.935% and 28.6725 dB, respectively, with the noise equivalent power (NEP) of 3.6845 × 10 ⁻⁸ W.

Related collections

Most cited references 69

Record: found
Abstract: found
Article: not found

Emerging photoluminescence in monolayer MoS2.

Andrea Splendiani, Liang Sun, Yuanbo Zhang … (2010)

Novel physical phenomena can emerge in low-dimensional nanomaterials. Bulk MoS(2), a prototypical metal dichalcogenide, is an indirect bandgap semiconductor with negligible photoluminescence. When the MoS(2) crystal is thinned to monolayer, however, a strong photoluminescence emerges, indicating an indirect to direct bandgap transition in this d-electron system. This observation shows that quantum confinement in layered d-electron materials like MoS(2) provides new opportunities for engineering the electronic structure of matter at the nanoscale.

0 comments Cited 2397 times – based on 0 reviews      Review now

Bookmark

Record: found
Abstract: found
Article: not found

Electronics and optoelectronics of two-dimensional transition metal dichalcogenides.

Qing Hua Wang, Kourosh Kalantar-Zadeh, Andras Kis … (2012)

The remarkable properties of graphene have renewed interest in inorganic, two-dimensional materials with unique electronic and optical attributes. Transition metal dichalcogenides (TMDCs) are layered materials with strong in-plane bonding and weak out-of-plane interactions enabling exfoliation into two-dimensional layers of single unit cell thickness. Although TMDCs have been studied for decades, recent advances in nanoscale materials characterization and device fabrication have opened up new opportunities for two-dimensional layers of thin TMDCs in nanoelectronics and optoelectronics. TMDCs such as MoS(2), MoSe(2), WS(2) and WSe(2) have sizable bandgaps that change from indirect to direct in single layers, allowing applications such as transistors, photodetectors and electroluminescent devices. We review the historical development of TMDCs, methods for preparing atomically thin layers, their electronic and optical properties, and prospects for future advances in electronics and optoelectronics.

0 comments Cited 1631 times – based on 0 reviews      Review now

Bookmark

Record: found
Abstract: found
Article: not found

DLS and zeta potential - What they are and what they are not?

Sourav Bhattacharjee (2016)

Adequate characterization of NPs (nanoparticles) is of paramount importance to develop well defined nanoformulations of therapeutic relevance. Determination of particle size and surface charge of NPs are indispensable for proper characterization of NPs. DLS (dynamic light scattering) and ZP (zeta potential) measurements have gained popularity as simple, easy and reproducible tools to ascertain particle size and surface charge. Unfortunately, on practical grounds plenty of challenges exist regarding these two techniques including inadequate understanding of the operating principles and dealing with critical issues like sample preparation and interpretation of the data. As both DLS and ZP have emerged from the realms of physical colloid chemistry - it is difficult for researchers engaged in nanomedicine research to master these two techniques. Additionally, there is little literature available in drug delivery research which offers a simple, concise account on these techniques. This review tries to address this issue while providing the fundamental principles of these techniques, summarizing the core mathematical principles and offering practical guidelines on tackling commonly encountered problems while running DLS and ZP measurements. Finally, the review tries to analyze the relevance of these two techniques from translatory perspective.