scanning electron microscope
DESCRIPTION
this is about SEMTRANSCRIPT
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SCANNING MICROSCOPE ELECTRON
SEM )
R E T N O W U L A N G A Y A T R I
1 1 0 6 0 0 8 2 4 6
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SCANNING MICROSCOPE ELECTRON ( SEM )
Dasar Teori
Kegunaan Alat
Cara Kerja
Preparasi Sampel
Kekurangan dan Kelebihan
Contoh dan cara Interpretasi Data
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DASAR TEORI
- Merupakan mikroskop elektron yang
memotret material berdasarkan
interaksi elektron dengan permukaan
material.
- Sampel berupa material padat
- Perbesaran 20x -500.000x
- Resolusi sampai 0.1-0.2 nm
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SEM
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KEGUNAAN ALAT
Mengetahui morfologi ( sifat permukaan )
suatu material :
- Ukuran Partikel / pori
- Bentuk partikel
- SEM yang dilengkapi EDX dapat
menentukan komposisi internal dari
partikel
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KEGUNAAN ALAT
Ceramic foam , perbesaran 20x
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Ceramic FoamPerbesaran
2000x
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KOMPONEN UTAMA
Sumber elektron ( electron gun )
Lensa elektron
Tempat sampel
Sistem vakum
Detektor
Alat output data ( Display )
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KOMPONEN
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- Sumber elektron ( Electron gun ) : memproduksi sinar elektron dan dipercepat dengan
anoda.
Berupa filamen ., terbuat dari unsur yang mudah melepas elektron.Misal : tungsten . Terdapat
2 jenis :
Termal
Field emission
- Lensa Elektron
Berupa lensa magnetik. Memfokuskan elektron menuju sampel . Tempat sampel :
Meletakkan sampel yang akan dikarakterisasi.
- Sistem Vakum
Menghilangkan molekul udara yang akan mengganggu elektron.
- Detektor
Mendeteksi sinyal elektron yang dihasilkan sampel
-Alat output Data
Memperlihatkan data berupa gambar.
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DETEKTOR
Secondary electron detector
Backscattered electron detector
Secondary electrons
Backscattered electrons
X-rays: Energy dispersive spectrometer (EDS)
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PRINSIP KERJA
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PRINSIP KERJA
1. Electron gun
memproduksi berkas elektron pada tegangan dipercepat sebesar
2-30kV
2. Sinar elektron mengalir melalui kolom mikroskop. Lensa magnetik
memfokuskan elektron menuju sampel.
3. Sinar elektron yang terfokus memindai ( scan ) keseluruhan sampel dengan
diarahkan oleh koil pemindai.
4. Elektron mengenai sampel, kemudian mengeluarkan elektron baru yang
diterima detektor dan diterima oleh monitor (
display
)
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HOW DO WE GET AN IMAGE?
156 electrons!
Image
Detector
Electron gun 288 electrons!
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SINYAL YANG DIHASILKAN SAMPEL
Incoming electrons
Secondary electrons
Backscattered
electrons
Auger electrons
X-rays
Cathodo-
luminescence (light)
Sample
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SINYAL SINYAL PENTING
Pantulan elastis sinyal Backscattered Electron
Pantulan inelastis sinyal elektron sekunder dan karakteristik sinar X
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Elektron Sekunder menghasilkan topografi dari
benda yang dianalisa berdasar tinggi rendahnya
permukaan.
Backscattered electron
memberikan perbedaan
berat molekul dari atom-atom yang menyusun
permukaan.
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E L E K T R O N S E K U N D E R B A C K S C A T T E R E D E L E C T R O N
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PREPARASI SAMPEL
1. Bersihkan sampel . Sampel harus dalam keadaan kering
2. Tempatkan sampel pada sampel holder
3. Jika sampel tidak bersifat konduktif, diperlukan coating dengan
sputter coater
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KEKURANGAN DAN KELEBIHAN
KE LE BIHAN
- Pengoperasian alatmudah
- Preparasi sampelyang tidak rumit
- Data dapatdiperoleh dengan
cepat
- Rentang perbesaranluas
KE KU RAN G AN
Sampel harus berupa
padatan
Untuk sampel yang
tidak konduktif
diperlukan coating
Resolusi rendah
dibanding TEM
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A. SEM/SE
(secondary electrons)
Morfologi Permukaan
Topologi Permukaan
B. SEM/BSE
(backscattered electrons)
Komposisi
C. SEM/STEM
(transmitted electrons)
Struktur Internal
D. SEM/EDX
(characteristic X-rays)
Analisis elemental
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SEM/SE micrographs showing
morphology of polymer blendPP/COC.
a) 90/10, b) 80/20, c) 70/30,
d) 60/40, e) 50/50, f) 25/75.
* PP = polypropylene* COC = cycloolefin copolymer
(copolymer of ethylene and
Norbornene)
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SEM micrograph of comb block copolymer showing spherical morphology and long
range order. Adapted from M. B. Runge and N. B. Bowden, J. Am. Chem. Soc.,
2007, 129, 10551. Copyright: American Chemical Society (2007).
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DAFTAR PUSTAKA
http://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=4403&context=etd( diakses
tanggal 25 Oktober 2014 09:00 WIB )
http://repository.usu.ac.id/bitstream/123456789/34572/3/Chapter 20II.pdf
http://cnx.org/contents/[email protected]:110
Erica Velacco. 2013. Scanning Elactron Microscope SEM ) as a means to
determine dispersibility.Iowa State University .
Power point presentation Scanning Electron Microscope by
Santanu Pramanik,hitesh
Kumar Gupta,chandan Singh
Power Point Presentation Scanning Electron Microscope by Adiyanti Firdausi
http://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.p
df/867c2d56-6453-4d8f-9d26-19e2c5dc143b
http://file.upi.edu/Direktori/FPMIPA/JUR._PEND._KIMIA/196808031992031-
AGUS_SETIABUDI/Bahan_Kuliah_Karakterisasi_Material/Bab_6_Teknik_Mikrosk
opy_SEM.pdf
http://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=4403&context=etdhttp://repository.usu.ac.id/bitstream/123456789/34572/3/Chapter%20II.pdfhttp://cnx.org/contents/[email protected]:110http://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.pdf/867c2d56-6453-4d8f-9d26-19e2c5dc143bhttp://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.pdf/867c2d56-6453-4d8f-9d26-19e2c5dc143bhttp://file.upi.edu/Direktori/FPMIPA/JUR._PEND._KIMIA/196808031992031-AGUS_SETIABUDI/Bahan_Kuliah_Karakterisasi_Material/Bab_6_Teknik_Mikroskopy_SEM.pdfhttp://file.upi.edu/Direktori/FPMIPA/JUR._PEND._KIMIA/196808031992031-AGUS_SETIABUDI/Bahan_Kuliah_Karakterisasi_Material/Bab_6_Teknik_Mikroskopy_SEM.pdfhttp://file.upi.edu/Direktori/FPMIPA/JUR._PEND._KIMIA/196808031992031-AGUS_SETIABUDI/Bahan_Kuliah_Karakterisasi_Material/Bab_6_Teknik_Mikroskopy_SEM.pdfhttp://file.upi.edu/Direktori/FPMIPA/JUR._PEND._KIMIA/196808031992031-AGUS_SETIABUDI/Bahan_Kuliah_Karakterisasi_Material/Bab_6_Teknik_Mikroskopy_SEM.pdfhttp://file.upi.edu/Direktori/FPMIPA/JUR._PEND._KIMIA/196808031992031-AGUS_SETIABUDI/Bahan_Kuliah_Karakterisasi_Material/Bab_6_Teknik_Mikroskopy_SEM.pdfhttp://file.upi.edu/Direktori/FPMIPA/JUR._PEND._KIMIA/196808031992031-AGUS_SETIABUDI/Bahan_Kuliah_Karakterisasi_Material/Bab_6_Teknik_Mikroskopy_SEM.pdfhttp://file.upi.edu/Direktori/FPMIPA/JUR._PEND._KIMIA/196808031992031-AGUS_SETIABUDI/Bahan_Kuliah_Karakterisasi_Material/Bab_6_Teknik_Mikroskopy_SEM.pdfhttp://file.upi.edu/Direktori/FPMIPA/JUR._PEND._KIMIA/196808031992031-AGUS_SETIABUDI/Bahan_Kuliah_Karakterisasi_Material/Bab_6_Teknik_Mikroskopy_SEM.pdfhttp://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.pdf/867c2d56-6453-4d8f-9d26-19e2c5dc143bhttp://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.pdf/867c2d56-6453-4d8f-9d26-19e2c5dc143bhttp://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.pdf/867c2d56-6453-4d8f-9d26-19e2c5dc143bhttp://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.pdf/867c2d56-6453-4d8f-9d26-19e2c5dc143bhttp://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.pdf/867c2d56-6453-4d8f-9d26-19e2c5dc143bhttp://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.pdf/867c2d56-6453-4d8f-9d26-19e2c5dc143bhttp://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.pdf/867c2d56-6453-4d8f-9d26-19e2c5dc143bhttp://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.pdf/867c2d56-6453-4d8f-9d26-19e2c5dc143bhttp://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.pdf/867c2d56-6453-4d8f-9d26-19e2c5dc143bhttp://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.pdf/867c2d56-6453-4d8f-9d26-19e2c5dc143bhttp://www.ntnu.edu/documents/139994/141053151/SEM+sample+preparation.pdf/867c2d56-6453-4d8f-9d26-19e2c5dc143bhttp://cnx.org/contents/[email protected]:110http://cnx.org/contents/[email protected]:110http://cnx.org/contents/[email protected]:110http://cnx.org/contents/[email protected]:110http://cnx.org/contents/[email protected]:110http://cnx.org/contents/[email protected]:110http://cnx.org/contents/[email protected]:110http://cnx.org/contents/[email protected]:110http://cnx.org/contents/[email protected]:110http://cnx.org/contents/[email protected]:110http://repository.usu.ac.id/bitstream/123456789/34572/3/Chapter%20II.pdfhttp://repository.usu.ac.id/bitstream/123456789/34572/3/Chapter%20II.pdfhttp://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=4403&context=etdhttp://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=4403&context=etd -
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TERIM
K SIH