Shivani Dhall

46 Questions 80 Answers 0 Followers

Questions related from Shivani Dhall

How we control humidity in gas sensor?

Is humidity introduce when Ar/N2 is used as carrier gas in gas sensor?

06 June 2017 9,719 0 View

Please suggest me supplier or labs where i get CNTs/Si junctions based substrate?

i want to observe compatibility..

03 March 2017 4,528 0 View

Can anyone tell me, which solvent is required for CNTs thin film deposition by spin coater?

Generally, CNTs has poor adhesion on Si wafer, when deposit their thin filmby spin coater. So, I need a solvent that help in good adhesion of CNTs by spin coater...

10 October 2016 6,360 7 View

Can anyone guide me about air brush technique to deposit the film of CNTs?

Which type of gun/air brush required for this?

10 October 2016 4,947 5 View

Can anyone suggest me, order of defect density in case of Graphene using Raman Spectrum?

In my case it comes 5e19cm-2... its very large as compared to reported values....

09 September 2016 4,592 0 View

Can anyone suggest me, how we calculate electrical band gap of CNTs?

Any appropriate technique specially for MWCNTs?

08 August 2016 2,565 2 View

Can anyone suggest me approximately value of electrical current in CNT/Pani Compoites?

with concentration of CNTs in polymer?

08 August 2016 9,468 3 View

Can any one suggest me, which type of sensors used to detect amount of, Chlorine, chloramine, Pb, VOC in water?

Plz suggest me some literature on theses type of sensors.

06 June 2016 2,388 2 View

Can any tell me, why resistance decrease as temperatures increase in case of MWCNTs?

generally, MWCNTs behave as semiconductor at room temperature.. in my case at room temperature, its i-v is perfect ohmic, but when we record i-v with temperatures.. i found that its resistance is...

05 May 2016 4,477 9 View

Can any one tell me, why electrical current is improved by the addition of CNTs in polymer matrix?

any conduction channel between them?

05 May 2016 9,951 0 View

Can any one tell me, can we use Ar MFC for ethanol sensing?

If yes, what about calibration?

04 April 2016 316 2 View

Can anyone guide me, what is minimum detection limit of NO gas (without affecting our health)?

I have to use this gas for sensing purpose.

04 April 2016 8,497 4 View

Can anyone tell me, what type of etchant used to etch Al metal after lithography?

Plz mention name of company... to procurement..

02 February 2016 3,566 4 View

Can anyone tell me, which type of materials are good for CO and NO sensor?

Also, i want to know Fabrication technique for detection of these gases?

01 January 2016 1,895 2 View

Can anyone suggest to me an appropriate technique to functionalize single layer graphene film?

Actually, i have no idea about the concentration of acids, if i adopt chemical route.. And also no idea about physical route...

12 December 2015 205 6 View

Anyone familier with temperature dependent behavior of CNTs?

in my case its behave as semiconductor

09 September 2015 2,145 0 View

What type of temperature controllers are used in temperature dependent gas sensor?

only heat the sensor from back side.

09 September 2015 7,872 8 View

How can we calculate theoretically the surface area of oxide nanoparticles attached on CNTs with the help of XRD?

In literature using density of oxide nanoparticles, we can calculate SS. Can same formula apply in case of CNTs?

10 October 2014 8,334 2 View

Can anyone tell me why the electrical current of MWCNTs decreased when we attached semiconductor particles like NiO, CuO and so on to their surface?

I need some papers which explain the mechanism between MWCNTs and oxide nanoparticles.

10 October 2014 3,794 4 View

Can any one give me some papers on I-V characteristics of covalently functionalized MWCNTs?

I need some literature on electrical transport of MWCNTs network.

10 October 2014 5,023 4 View

Can anyone suggest some literature on theoretical consideration of Pt/CNTs based H2 gas sensors?

I need absorption coefficient value of CNTs as well as Pt for H2 senors.

09 September 2014 5,958 1 View

Why do MWCNTs behave as p-type semiconductors in H2 atmosphere, although they previously behaved as a metallic?

Why does it transform into a p-type semiconductor?

06 June 2014 5,406 1 View

Can anyone suggest to me some details on the electrical transport behavior of MWCNTs and their composites with metal nano-particles.

What is the role of DOS in MWCNTs?

06 June 2014 5,735 2 View

Can anyone tell me why inter planer spacing is changed in the case of CNTs after attachments of nano-particles?

In my case, the value of 2 theta is changed from 25.8 to 26.01 for (002) carbon plane, after attachment of oxide nano-particles on the CNTs.

05 May 2014 7,118 7 View

Can anyone suggest a H2 gas sensing mechanism for MWCNTs/ZnO structures?

I need some good papers on that.

05 May 2014 2,424 1 View

Can we calculate the crystallite size of metal decorated CNTs using: La (nm) = 560/E4(IG/ID) using raman spectra?

I have found that the Raman signal intensity decrease after hybrid nanostructure.

04 April 2014 6,060 3 View

What is the basic mechanism of H2 sensor for p-type nanoparticles (Cu2O and NiO2) attached MWCNTs at room temperature conditions?

According to literature, MWCNTs act as p type semiconductor in H2 sensor, but when p-type nanoparticles attached on these it behaves more like p-type.

04 April 2014 4,371 1 View

Why does blue shift occur in Raman bands of CNTs?

I have attached metal nano-particles on the tubes.

03 March 2014 3,591 2 View

Can anyone suggest me some books or papers on CNTs, especially MWCNTs structure and its properties?

03 March 2014 6,336 0 View

How to best calculate the number of atoms (N) in one Ag particles using formula?

I have an idea about one formula : 381.51*4/Volume of unit cell, but i am not sure.

02 February 2014 1,168 10 View

Can any one tell me why the electrical current of metal decorated nanotubes is increased?

Is density state increased?

10 October 2013 9,704 5 View

Can anyone tell me what is the effect of higher temperature on the I-V curve of the MWCNTs?

Is its resistance increased or decreased ?

09 September 2013 286 3 View

What type of a curve do we obtain when we take I-V data of MWCNTs with higher temperature?

An exponential curve between temperature variation and in resistance?

09 September 2013 3,577 1 View

Can any one tell me the temperature-dependent (up to 150 Celsius) behavior of MWCNTs?

It is linear curve or exponential curve.

09 September 2013 5,790 2 View

What is effect of impurities or functionalization on the pi system on CNTs?

Electrical point of view...

09 September 2013 6,009 3 View

Can someone suggest a conductive mechanism of nanotubes?

On electrical basis.

09 September 2013 4,832 3 View

Can anyone recommend the basic mechanism of MWCNTs/ZnO based H2 sensor at room temperature conditions?

I have done this experiment in inert atmosphere with 1% O2...

08 August 2013 3,293 10 View

Can anyone tell me why the value of Id/Ig is decreased for the nanoparticles attached MWCNTs?

Is it due to removal of amorphous carbon?

08 August 2013 5,590 10 View

Can anyone tell me, what is the basic mechanism for H2 detection of ZnO/MWCNTs at room temperature within inert gas atmosphere?

08 August 2013 4,418 1 View

Can anyone tell me, why electrical transport increased after the deposition of metals (Pd or Pt) on the MWCNTs?

shifting in Fermi Level?

07 July 2013 8,255 7 View

What is the sensing mechanism of P-type semicoductor (NiO) for H2 gas at room temperature in the atmosphere of inert gas?

Does oxygen play a role?

07 July 2013 8,366 4 View

Can anyone tell me why the XRD peak shifts when we attach nanoparticles on the MWCNTs?

...

06 June 2013 5,377 3 View

I have used oxides. But no results. How can we increase the sensitivity of CNTs for H2 gas at room Temperature?

04 April 2013 4,113 5 View

How to synthesis silver/CNTs composities?

03 March 2012 2,549 2 View

Can u tell me simple method for copper nanoparticle synthesis

10 October 2011 7,334 7 View

for knowledge enhace in nanophysics

hello sir

07 July 2011 3,073 2 View