Why graphene shows a peak in UV Vis spectra?

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Does magnetic force microscopy (MFM) give phase difference for paramagnetic materials as well?

If I do MFM paramagnetic thin film patterned on SiO2, will it give a phase difference like ferromagnetic films?

31 December 2019 1,132 2 View

How to calculate total resistance for graphene FET?

which method we should follow to calculate total resistance (Rt) for graphene FETs 1. Rt = drain-source voltage/drain current Rt = Vds/Id with constant gate voltage (Vg) and varying Vds 2....

31 December 2017 6,398 5 View

How to calculate residual carrier density in graphene FET?

How can we calculate residual carrier density (no) in Graphene FETs from ID-VG plot?

04 May 2017 2,400 5 View

Decomposition of water into OH

How we can decompose water in to Oh and oxygen?

11 December 2016 1,647 1 View

Why all publications show different C1s peak valued for graphene ?

why all publications shows different peak values for sp2 carbon, COH, C-O, C=O, COOH

08 September 2016 9,947 1 View

What is the effect of acetone on Graphene ?

During transfer of graphene from Cu foil to SiO2 we use acetone to remove PMMA from graphene surface, is there any effect of acetone on graphene's chemical or electrical properties.

02 March 2015 7,399 9 View

Why contact resistance has unit ohm-um?

If we see the TLM structure and plot of total resistance vs channel length, we can calculate contact resistance from Y-intercept. But papers shows the unit of contact resistance in ohm-um. Why is...

01 January 1970 1,077 4 View

How can we calculate residual carrier density in Graphene FETs?

How can we calculate residual carrier density (no) in Graphene FETs for back gated devices

01 January 1970 3,054 0 View

Which type of compound does lamda max of 218 indicate in a uv-vis spectrum of a partially purified compound through column and TLC?

A crude extract of fungal culture using EtOH was subjected to column and TLC and partially purified compound was obtained. UV vis spectrum of the compound/s has max absorbance at 218nm. The...

11 August 2024 9,801 2 View

Baseline drift in HPLC? What causes this?

Hello, Why do i see this baseline drift when i compare my blank (black) to the sample (blue)? Any suggestions as to why this happened? Thank you!

11 August 2024 3,770 4 View

What is the best conditions for formation Magnetite ore deposits?

I want to know more about Magnetite deposits.

06 August 2024 1,066 0 View

Why might the impedance values for DI water and 0.1X PBS buffer solution exhibit a decreasing and increasing trend, respectively over time (HP 4194A)?

Hello everyone, I'm encountering an issue with my electrochemical impedance spectroscopy (EIS) measurements and would appreciate some insights. Experimental Setup: Electrodes: Gold interdigitated...

05 August 2024 3,783 2 View

Short Synthesis of Graphene Oxide from Natural Graphite Flakes?

I am in search of a modified Hummer's method, which can be used to synthesis graphene oxide within 6-8 hours. As I am a student it is not allowed for us to work after 5 in the laboratory. So I am...

01 August 2024 8,368 2 View

Can a Conventional 50W visible LED Lamp Emit UV Light?

I'm researching light sources and their UV emissions. I'm curious if a 50W, 7500K conventional LED lamp emits any UV light. I found that a 200W tungsten lamp can emit up to 1.5 mW/cm² at 350 nm....

31 July 2024 3,843 7 View

Mossbauer spectroscopy Co0.6Mn0.4Fe2O4 MNPs?

Following curve related to Co0.6Mn0.4Fe2O4 Magnetic nanoparticles with extra phase a-Fe2O3. I will appreciate to help me to interpretation this spectroscopy, especially the blue line.

31 July 2024 9,140 2 View

¿Are oxygen vacancies in semiconductors capable to change the band gap?

Dear all! Oxygen vacancies do raise negatively the Fermi level by increasing the negative charge in the semiconductor crystal structure. In the case of n-type semiconductors, I wonder if this...

30 July 2024 8,339 2 View

How can I separate graphene from amorphous carbon of similar particle sizes?

The starting material is a finely ground powder. Some particles contain more graphene than others.

30 July 2024 3,978 2 View

How to calculate conductivity using Electrochemical Impedance Spectroscopy's Nyquist plot?

Hello everyone, I am new to this characterization but watching videos on youtube I have already plotted a Nyquist plot (Z' and -Z'') and already fitted models on my material using Zsim. But now I...

29 July 2024 1,376 0 View

Md. Abdur Rahman

Graphene contains almost conjugated double bonds in it structure. Therefore, pi to pi star transitions occurred during UV-vis light irradiation.

Article Research Article Synthesis and Characterization of Graphene ...

Mohd Shoeb

Single layer graphene has zero band gap. Multilayer graphene showed absorbance peak due to conjugated double bond. And please don't use tauc relation to calculate graphene band gap.

Ebrahim Mahmoudi

the peak at 231~236 nm is due to π to π* transition of C=C bonds.