On what basis the semiconductors were named as direct and indirect bandgap semiconductors?

On what basis the semiconductors were named as direct and indirect bandgap semiconductors? What are the properties makes the materials into direct and indirect bandgap semiconductors. Please...

01 January 1970 8,661 10 View

What is the role of green surfactants (Plant extracts) for the synthesis of Metal oxide nanoparticles?

I was used some plant extracts for the synthesis of metal oxides under the ultrasound irradiation. I got the uniform sized nano particles.

01 January 1970 4,125 4 View

Why the crystallinity of metal oxides increases on calcination?

material chemists

01 January 1970 9,984 3 View

How to confirm the dopant? weather it is in crystal lattices or on the surface by XPS?

Dear sir/Madam, I have synthesized the Cu doped TiO2. i got the XPS results. from that the Cu confirmed as Cu (II) state. My question is weather it is in crystal lattices of TiO2 or on the surface...

01 January 1970 4,171 6 View

What is the effect, If we use Mn3O4 and Mn2O3 composite material for Li ion battery application?

I have the synthesized manganese oxide material, But the XRD matched with Mn3O4 and Mn2O3. What about the Li ion battery performance, Weather it is good or bad?

01 January 1970 1,369 3 View

What is the colour of SnWO4 nanopowder?

I have been synthesizing SnWO4 nano powder with black color. What is the exact color for this compound?

01 January 1970 3,027 7 View

Is TiO2 belongs to direct or indirect bandgap semiconductor?

Weather the TiO2 belongs to direct or indirect band-gap semiconductor?. One of the reviewer mentioned that TiO2 is a Indirect band-gap semiconductor. Please let me know.

01 January 1970 5,369 3 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

Is There Any Feasible Method To Test Fluorescent Compounds Other Than Fluorescence Spectrometers ??

Is There Any Feasible Method To Test The Efficiency Of Fluorescent Compounds Other Than UV Spectrometers ? Suggestions Would Be Appreciated !

02 March 2021 5,785 3 View

Is there any effect of different colours of light (white, red, yellow, blue etc.) on the rate of photosynthesis? If yes, why?

Light is inevitable for the process of photosynthesis reaction. Naturally sunlight plays the vital role for this process. Light may be of different colours like white, red, yellow, blue etc....

02 March 2021 7,890 2 View

Any research papers for extraction of nutrient deprivation on macroalgae? Analysed by HPLC-UV and GC/MS. Possibly from macroalgae genus Rhizoclonium?

I am doing my thesis on the nutrient deprivation on the macroalgae Rhizoclonium sp. I will be analysing the levels over a period of roughly 5 days by HPLC-UV and GC/MS. I will be using seawater as...

28 February 2021 6,477 1 View

In an eye with Tyndall, does each dot correspond to an individual cell?

When you observe the presence of Tyndall in an inflamed eye: Does each of the small floating dots correspond to an individual cell or to an aggregate of cells? Does a conventional slit lamp have...

27 February 2021 6,326 2 View

How can Gamma Ray API units be converted to CPS (counts per second)?

Oil and gas companies run gamma ray tool and take readings in API units while Gamma ray is also noted in cps, so how these units can be converted into each other?

24 February 2021 7,545 2 View

How can I obtain time series data by country on night-time light (brightness) ?

Hi everyone, Please, how can I obtain time series data by country on night-time light (brightness) ? I've tried, but so far all I can find are maps. I am looking for numerical data, especially in...

24 February 2021 8,625 4 View

What are difference between laser diodes, simple light emitting diodes and power light emitting diodes when operated in the visible spectrum ?

I want to illuminate a scene (small space) using LED to capture photographs or videos of some tiny objects inside the space. But am not sure if I should use a Laser LED, or simple LED or power...

22 February 2021 4,240 4 View

Could the "incoming radiation (net radiation)" values be negative?

Could the "incoming solar radiation" values be negative? What is the difference between "global solar radiation" and "incoming solar radiation"? Which one might be measured negative values?

21 February 2021 7,726 9 View

How to interpret this FTIR spectrum of pyrolyzed hydrochar?

20 February 2021 2,840 3 View