Which is the best procedure to measure the absorbance of nanopowders using uv-vis spectrophotometer?

I have several nanopowder samples synthesized in our lab and I would like to compare their absorbances as a function of the various treatments. We have a uv-vis spectrophotometer, so please advise...

07 August 2015 2,400 5 View

How good are carbon contacts for MIS structures compared with other metal contacts like Ni, Au and Al?

To perform electrical measurements on thin film devices, we always need ohmic metallic contact electrodes. The most commonly used metals are Au and Al. I would like to use carbon paste but I have...

10 November 2014 1,152 2 View

How does the bias voltage affect/influence impedance properties of a MOS structure?

I have done impedance measurements of a metal-oxide-semiconductor structure as a function of the bias voltage. The radius of the impedance arc in the Nyquist plot decreases with and increase in...

09 October 2014 7,830 3 View

Are all metal acetylacetonate precursor salts soluble in ethanol?

I want to deposit zirconium oxide by spray pyrolysis. I am not a chemist and I need the advice of chemists out there. Is zirconium acetylacetonate soluble in ethanol? I found that it is soluble...

09 October 2014 7,158 5 View

How can I calculate film thickness and refractive index from UV-vis reflectance and/or transmittance data only, without interference fringes?

For thicker homogeneous films, the optical reflectance and transmittance spectra show several interference patterns which can be used to obtain optical constant using Swanepoel and other related...

09 October 2014 5,691 10 View

Is it possible to measure transistor output and transfer characteristics using Autolab setup?

I am preparing to start working on thin film transistor (TFT) devices from metal oxides. In literature I have seen most people use semiconductor parameter analyzers for measuring drain current as...

08 September 2014 7,112 5 View

How can I prepare a mask for fabricating a metal oxide thin film transistor?

I want to fabricate thin film transistors as part of my new research work. I would like to know how I can make good masks that I need to use during deposition of the different layers....

04 May 2014 3,382 2 View

What is the decomposition temperature of indium chloride, indium acetylacetonate and antimony chloride?

The difference in the deposition rates in sprayed thin films between different precursors in highly dependent on their decomposition temperatures, and residence time on the substrate. How do I get...

01 February 2014 6,523 2 View

How is the droplet size in an aerosol in a spray pyrolysis experiment calculated?

I sprayed my samples by nebulizing/atomizing a precursor solution of InCl3 salt dissolved in ethanol solvent. I would like to know the size of the aerosol droplet. Is there a way of calculating...

31 December 2013 6,812 6 View

Why are indirect semiconductors used as absorbers in solar cells despite their inferior absorption coefficient compared to direct semiconductors?

How does the nature of the band gap (direct or indirect) affect the efficiency of a solar? Recombination processes must be different for solar cells made from these solar cells, how does this...

10 November 2013 167 7 View

Ester cleavage conditions?

Hi all, I need to cleave the ester in Ethyl 2-amino-1H-imidazole-5-carboxylate to make the carboxylic acid and retrieve the product from solution to use in downstream applications of linking to...

01 March 2021 8,766 3 View

How to simultaneously perform multiple biochemical assays?

I am a research scholar working on heavy metal stress on plants. I will be doing biochemical characterisation( protein, carbohydrate, proline, antioxidant enzymes and many more assays) at interval...

01 March 2021 6,999 3 View

1 nm thick MgO thin-film to be deposited on Si wafer using thermal evaporation. What will be the optimum deposition conditions?

Favourable conditions of base pressure, rate of deposition. Also, by which characterisation technique to be used to verify the thickness of the deposited film.

28 February 2021 3,640 3 View

How to prepare a thin polymer film by post-polymerization/crosslinking?

24 February 2021 2,362 5 View

Is is possible to pole with corona poling pellets of the sample material instead of thin films?

As it is highly probable that pellets will have a higher degree of air gaps and voids than thin films, is it possible to pole the samples with corona poling nevertheless? Or is there the...

24 February 2021 1,349 1 View

Why is NH4OH added in heavy metals limit test?

The limit test I'm referring to is USP method II. In this procedure you need to dropwise add 6N of NH4OH to the sample until it the pH is alkali. After that you need to dilute and add HOAc until...

23 February 2021 2,049 3 View

Is this the write procedure for acid digestion of soil for heavy metal analysis using AAS?

How to do acid digestion of soil sample with 3:1 aquaregia in an open vessel?

23 February 2021 3,053 7 View

How to troubleshoot Electrochromic Films and Electrochromic Devices?

I am trying to characterize an electrochromic system. The system uses ITO electrodes on glass, WO3 as the electrochromic film, and NiO as the ion storage layer. When I deposit NiO and WO3 and...

23 February 2021 9,592 2 View

How to improve the adhesion between germanium and silicon monoxide thin film layers using EBEAM evaporation?

I want to deposit multilayer coating of germanium and silicon monoxide on silicon wafer using ebeam evaporation?

21 February 2021 2,141 3 View

How can I measure the thickness of thin layers deposited on textured glass susbtrates?

I want to measure the thickness of aluminum oxide and titanium oxide layers deposited on textured glass substates. The layer thicknesses are typically below 100nm.

21 February 2021 5,465 4 View