Band-gap (Eg) of UV-Vis Absorption Spectra Using Tauc Plot - Origin Plot/ Band-gap of ZnO

Plot of (αhν)2 vs hv indicate energy value Eg in direct band-gap semiconductors like ZnO.

[@gyanendrabhattarai6490]

You need to change the origin of Y axis at zero. Make sure you do right before sharing!

[@zahidurrahaman428]

Very helpful. Thank you. Keep up the good work.

[@jorgegutierrezcifuentes9050]

Excellent!

[@quynhnga4947]

If the curves have a lot of linear part, how to know to choose linear part suitably? Thanks.

[@comander875]

You don`t know ,how much do i owe you, FUCK! I am sooooo gratefullll!!!

[@JohnIgnou]

Very hepful thank you so much!

[@gezelleme4627]

For instence (Fist row value of Absorbance and absorption coefficient ), If we divide 1.33/(4*10^-6), it should be ~10^6 not as you calculated ~10^-7.

[@chellapparajamani876]

Put up the video vickers microhardness testing . How i calculated meyer index n value .

[@anupamphysicist1]

Y axis will start from 0

[@vlkplz]

In my opinion α is ABS/0.4343/length of sample, due to ABS = log(Io/I) but we have I = Io*exp(-α*length) so ln(Io/I)= α*length. ABS is in log not ln

[@physiquenajeh1475]

Nice vedeo

[@winl5455]

One question: if your film is 4 um, Thus the column C should be Col(b)/(4*10^-6) = Col(b)/4*1000000. But your function is Col(b)/4*0.000001

[@poojarnair2256]

yes

[@JK-xe3nu]

If you x start from -500, what energy it gives you

[@sakshithakur8927]

from 10^-6 came?

[@divyadharshinis8495]

how to find the thickness of the sample

[@shobanamohanasundaram6215]

How to know the thickness for a powder sample?

[@fragoma071]

did you alredy know how?

[@thienphung9666]

@@fragoma071 how to know the thickness?

[@mushahidhussain2460]

By using Scanning electron microscope (SEM) use image j software to find thickness of the powder. For film thickness a digital vernier caliper or a meter easily available.

[@randomola9657]

Question: how you know for the thickness ? From data or what ?

[@3dartstudent973]

Same question

[@safdarali8740]

@@3dartstudent973 from profilometer i think

[@vipulpatel5249]

You have to measure with instrument.

[@mushahidhussain2460]

Vernier caliper or also meter available

[@mushahidhussain2460]

Vernier caliper or also meter available

[@physicistmaryam8718]

From where we ll get know thickness of sample?

[@mushahidhussain2460]

By using a meter to find thickness of the sample

[@rathirathi6386]

app name pls

[@prachiPrachi-sk4ih]

In UV we are using liquid samples so how can we take about the thickness.

[@user-oe5ct1fw4m]

You would use Beer's Lambert Law, replacing sample thickness with the light path length (d) through your sample.

[@tot1928]

Absorption coefficient
α=2.303 (A/d)
where
(A) is the absorbance
(d) is the sample thickness (cm).

[@randomola9657]

Kak mau tanya untuk thickness ini emang ketentuan rumusnya atau bagaiamana ya?

[@sitinurulafifah522]

Apa punya software OriginLab?

[@sitinurulafifah522]

Apa boleh minta softwarenya kak?

[@bharathimeti7753]

Please explain verbally

[@Preeti_Snigdha]

delete this video...because it misleads the viewers...according to this video one can carry the band gap value desirably by changing the y-axis range..... The y-axis must start from zero because the energy at alpha*hv = 0 gives the badgap