How can I increase the Responsivity of Graphene ?

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How to make PDMS film (or stamp) in the laboratory in order to use it for dry transfer of thin films (< 1 mm) (pick-up and release technique)?

Polydimethylsiloxane (PDMS) stamp is used for the deterministic placement of 2D materials and the fabrication of van der Waals heterostructures.

11 December 2019 6,968 3 View

Why does the quenching of intensity occur in Graphene/MoS2 hetero-structure as a consequence of Photo-luminescence?

Can you explain in a more practical point of view?

08 September 2019 3,970 3 View

Which technique (reported till date) is proved to be the best in order to get "Direct CVD grown Graphene" of high crystalline quality on an Insulator?

Is there any better technique relative to one reported by Kwon and co-workers, The interfacial segregation growth technique using Graphite powder coating on a poly-crystalline Ni layer (deposited...

01 February 2019 7,832 4 View

Do the properties of bernal stacked bilayer graphene exactly match with the mechanically stacked (AB_AB like) bilayer graphene ?

Is the processes of stacking the monolayers mechanically and exfoliating a bernal stacked multilayer graphene to yield a perticular microstructure "reversible" in terms of optical and electrical...

01 February 2019 2,242 5 View

Tell me the technique by which Cu substrate can have more (111) facets, so as to get high quality, large- area, uniform CVD grown monolayer graphene?

Hexagonal lattice of Cu (111) (crystal plane) favors the high quality of CVD grown Graphene. Graphene have preffered orientations and similar crystallographic geometry as that of the underlying...

01 February 2019 2,017 3 View

What are "Kohn anomalies" in terms of Raman Scattering Process in Graphene?

Concept of "Kohn Anomalies" is a historic background concept, when we deal with the characterization of Graphene sample.

01 February 2019 9,361 1 View

Twisted bilayer Graphene shows superconductivity. Do the pi- electrons moving between the two layers form cooper pair or is it in other way around?

stacking one layer on another monolayer of graphene in a 'magic angle' changes the properties of the bilayer significantly. Which phenomenon will be responsible for the superconductivity. I...

31 December 2018 2,347 7 View

Can a Bilayer graphene show the electronic structural properties as that of an isolated monolayer graphene?

Is there a way, to get the same electronic structure of the Bilayer graphene and isolated monolayer graphene?

31 December 2018 1,814 8 View

What are the Von-Hove singularities in the density of states' curve of graphene?

Von- Hove singularities are said to be non-smooth points corresponding to M-points in first B.Z. What do they actually signify?

31 December 2018 4,883 3 View

What is the physical significance of berry's phase in solids?

berry's phase is also said to be a 'spinor property'. why is it so important in solid state physics?

31 December 2018 8,473 3 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 View

Physics: Why do we describe light by referring to its wavelength, but microwaves and radar pulses by referring to their frequency?

In physics, the description of the properties of light generally refers to its wavelength (nm), while in the range of microwaves and radio waves we refer to the frequency of a signal (e.g. kHz or...

03 March 2021 1,682 3 View

What is the most Operating System (OS) which can be INSTALL on Tiny hard devices like Raspberry Pi (RPi) hardware ?

I'm targeting to deploy a mesh network and manually configure MANET routing protocols. I'm preparing scenarios, architectures, and hard devices needed to do that. Are there some step-by-step...

03 March 2021 1,931 5 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View

Waters 2707 HPLC autosampler problem?

I am using a 2707 waters HPLC device. When I try to inject a sample, it says missing plate or rack. I changed the needle and calibrated its position but I still get the same problem. I even get...

02 March 2021 1,408 1 View

Why are the velocities so high in my Boussinesq approximation Fluent simulation?

Hello, I have a mechanism where air rises due to convective flows. In this simulation, nothing is driving the air except this. I understand that the Boussinesq approximation only works for small...

02 March 2021 4,910 3 View

12% ledeburitic cold work tool steel, etched for revealing retained austenite, any help for clarifying?

Hello everyone. Given microstructure image belongs to a 12% ledeburitic cold work tool steel (annealed and tempered). The sample was etched with picral (100 mL ethanol and 4 g picric acid). I...

02 March 2021 4,119 3 View

Why almost every element would be metallized in sufficiently high pressure and low temperature?

(This statement is from wikipedia, BTW). What is so special about metallic bond that is limiting high-P low-T state of a matter (as long as individual atoms exist, not white dwarf of neutron star...

02 March 2021 3,309 2 View

How can I integrate a routing protocol in a tiny device (e.g. Raspberry Pi)?

Hi Community, I'm facing the issue of integration/compiling a new routing protocol in a WSN simulator. The final goal is to successfully add, configure this routing protocol in hardware devices...

01 March 2021 9,332 6 View

Mukesh Pandey

Intrinsic responsivity of graphene is quite small i.e unwanted for its application as detector, so what are the ways to increase its responsivity?

As far as I know, we can make graphene based heterostructures or patterned structures to achieve this.

Xuhua Wang

Dear Mukesh,

Do you make a photodetector based on graphene as a hole injector/transport or conductor? What is the device structure which is crucial to the sensitivity of a photodetector?

Xuhua