HYBRID EVENT: You can participate in person at Orlando, USA or Virtually from your home or work.

6th Edition of World Nanotechnology Conference

April 24-25, 2023

April 24 -26, 2023 | Orlando, USA
World Nano 2023

Mohammed Awid Alamri

Mohammed Awid Alamri, Speaker at Nanotechnology Conferences
Umm Al-Qura University, Saudi Arabia
Title : Synergetic effects of plasmonic ag nanoparticles and plasmonic WS2 nano disc hybrid underneath graphene layer for enhanced photodetector


Two-dimensional (2D) materials van der Waals (vdW) heterostructures, such as stacking Transition Metal Dichalcogenides (TMDs) on graphene, have improved the performance of optoelectronics devices. Also, plasmonic metal nanostructures enhance the light absorption in 2D materials and their heterostructures due to the strongly enhanced local ?eld intensity around metal nanostructures. Here, we developed a photodetector based on Ag nanoparticles embedded in silica beneath the WS2 nanodisc/graphene vdW heterostructure to improve the photodetection through the coupling of plasmons and excitons. The device exhibits a high performance with a responsivity of 8 A/W, at Vsd = 0.8 V and wavelength of 450 nm. This value of responsivity is at least 500% enhancement compared to the device without AgNPs. measured under the same conditions. This enhancement can be attributed to the strong coupling of the plasmons and excitons in the WS2 nanodiscs/graphene/AgNP heterostructures. In addition, the photo-doped WS2 nanodisc possibly generate the localized surface plasmon resonance (LSPR) and enhance the performance of the photodetector. This device is therefore a promising for high-performance optoelectronics applications.

Audience Take Away:

  • The vdW heterostructures improve the performance of the optoelectronic devices.
  • The performance of TMDCs/graphene photodetector is further enhanced by plasmonic metal NPs.


Dr. Mohammed Alamri studied Physics at Malaya University, Malaysia and graduated as MS in 2010. He then joined the Physics Department, Umm Alqura University, Saudi Arabia. He received his PhD degree in 2021 at Kansas University, USA. Then, he obtained the position of an Assistance Professor at the Physics Department, Umm Alqura University, Saudi Arabia. He has published more than 16 research articles.