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WorksheetsTEM & STM
Total questions: 10
Worksheet time: 10mins
TEM analyses the electrons which are ---------
absorbed
scattered
transmitted
adsorbed
HR-TEM studies of nanomaterials is perfect for imaging materials on the ------------
micro scale
macro scale
atomic scale
molecular scale
In HRTEM, the image formed by the interaction of electrons transmitted through the sample; the image is magnified and focused onto an imaging device such as ------
Digital camera
Fluorescent screen
Photo film
Thin film
The main advantage of TEM is that it can simultaneously give information in ---------- & ----------- mode
imaging, reflection
normal mode, reflection
imaging, diffraction
serial mode, refraction
In HR-TEM, the following chemicals are used for sample preparation. (Select all that apply).
cacodylic acid buffer
OsO4
epoxy resin
Hydrochloric acid
STM is an instrument for imaging the sample surfaces at the ----------------- & ------------ of the sample
molecular scale, DoS
nano scale & Pattern
atomic scale & local DoS
micro scale & local DoS
STM works on the principle of ----------
Surface Plasmon Resonance (SPR)
coulomb blockade effect
Tunneling effect
surface scattering
In STM, the injecting electrons into the molecule causes a ------------- & produces -----------.
micro scale vibration, tunneling current
molecular vibration, scattering current
molecular vibration, tunneling current
macro scale vibration, electrical current
In STM, the probe tip is made of --------------
Aluminium
Platinum
tungsten or platinum-iridium alloy
stainless steel alloy
The two main kinds of operation modes of the STM are constant ------------ mode and constant ----------- mode
magnetic, emission
current, pulse
magnetic, vibration
current, voltage
