TEM measurements were performed using a FEI Technai G2 F20. Samples were drop‐cast onto carbon foil on copper grids (Quantifoil), for aerogel samples small amounts of aerogel were dispersed in acetone by ultrasonication for 5 seconds before drop‐casting.
Technai g2 f20
Manufactured by Thermo Fisher Scientific
Sourced in United States
The Technai G2 F20 is a high-performance transmission electron microscope (TEM) designed for materials science and life science applications. It features a field emission gun (FEG) electron source, advanced optics, and a variety of imaging and analytical capabilities. The Technai G2 F20 allows for the examination and characterization of samples at the nanoscale level.
Automatically generated - may contain errors
Lab products found in correlation
Copper grids, by Quantifoil (1 mentions)
K alpha, by Thermo Fisher Scientific (1 mentions)
Verios 460, by Thermo Fisher Scientific (1 mentions)
Helios 650, by Thermo Fisher Scientific (1 mentions)
Vertex 80, by Bruker (1 mentions)
Titan cube g2 60 300, by Thermo Fisher Scientific (1 mentions)
Smartlab x ray diffractometer, by Rigaku (1 mentions)
V 670, by Jasco (1 mentions)
D max 2200 pc, by Rigaku (1 mentions)
5 protocols using technai g2 f20
1
TEM Analysis of Aerogel Samples
2
Characterization of Carbon Nanotubes and Nanocomposites
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The structure and
morphology of CNTs and nanocomposites were characterized via Raman
spectroscopy (via excited by a 514 nm laser, Renishaw, U.K.), transmission
electron microscopy (TEM, Technai G2 F20, FEI), and field-emission
scanning electron microscopy (FE-SEM, Verios 460, FEI). The TEM sample
preparation was undertaken using focused ion beam scanning electron
microscopy (FIB, Helios 650, FEI). The chemical properties of the
surface of the CNTs after the VUV-excimer irradiation were characterized
via Fourier transform infrared spectroscopy (FTIR, Nicolet iNTM10
infrared microscope, Thermo Fisher Scientific) and X-ray photoelectron
spectroscopy (XPS, K-Alpha, Thermo Fisher Scientific). The thermodynamic
reactions were analyzed through thermogravimetric-differential scanning
calorimetry (TG-DSC, Labsys Evo, Setaram, France). The oxygen desorption
progress was analyzed via mass spectroscopy (BGM202, Ulvac, Japan)
using TG-DSC in a He atmosphere. The tensile strength of nanocomposite
films was tested by a mechanical testing machine (model 5567A, Instron
Corp.) using a displacement rate of 1 mm/min. The tensile test specimens
were prepared according to ASTM638-14 and had a 25 mm gauge length.
All samples were tested five times so that the results are reliable.
The fracture dynamics were characterized via an in situ micro tensile
test (2 kN, DEBEN UK Ltd., U.K.).
morphology of CNTs and nanocomposites were characterized via Raman
spectroscopy (via excited by a 514 nm laser, Renishaw, U.K.), transmission
electron microscopy (TEM, Technai G2 F20, FEI), and field-emission
scanning electron microscopy (FE-SEM, Verios 460, FEI). The TEM sample
preparation was undertaken using focused ion beam scanning electron
microscopy (FIB, Helios 650, FEI). The chemical properties of the
surface of the CNTs after the VUV-excimer irradiation were characterized
via Fourier transform infrared spectroscopy (FTIR, Nicolet iNTM10
infrared microscope, Thermo Fisher Scientific) and X-ray photoelectron
spectroscopy (XPS, K-Alpha, Thermo Fisher Scientific). The thermodynamic
reactions were analyzed through thermogravimetric-differential scanning
calorimetry (TG-DSC, Labsys Evo, Setaram, France). The oxygen desorption
progress was analyzed via mass spectroscopy (BGM202, Ulvac, Japan)
using TG-DSC in a He atmosphere. The tensile strength of nanocomposite
films was tested by a mechanical testing machine (model 5567A, Instron
Corp.) using a displacement rate of 1 mm/min. The tensile test specimens
were prepared according to ASTM638-14 and had a 25 mm gauge length.
All samples were tested five times so that the results are reliable.
The fracture dynamics were characterized via an in situ micro tensile
test (2 kN, DEBEN UK Ltd., U.K.).
3
Synthesis of PEI-Coated Iron Oxide Nanoparticles
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A 20% (w/w) PEI solution (8.5 ml) was prepared using distilled ethanol and it was added to a solution of 5 M NH4OH (20.0 ml). Then the mixture was stirred at 50° C using a magnetic stirrer. After about 5 min, 0.80 g of pre-synthesized iron oxide nanoparticles was added and stirring was continued for another 30 min. The resulting slurry was separated using a magnet and the pellet was washed with double distilled water several times. A portion of the pellet was dried and was characterized using FT-IR spectroscopy (Bruker Vertex 80), X-ray diffraction (XRD; CuKα = 1.5418 Å, Bruker D8 Focus X-Ray diffractometer) and scanning transmission electron microscopy (STEM—Technai G2 F20, FEI Company).
4
Morphological Analysis of Boron Nitride Nanotubes
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The morphology of BNNTs and impurity was investigated using scanning electron microscopy (NanoSEM-460, FEI, Hillsboro, OR, USA), transmission electron microscopy (TEM) (Technai G2 F20, FEI, Hillsboro, OR, USA) at 200 kV and high-resolution TEM (Titan G2 Cube 60-300, FEI, Hillsboro, OR, USA) at 80 kV. The SEM images of the samples were prepared by filtering the solution. The TEM image of the samples was fabricated by dropping the solution on the lacey carbon film on the copper grid. To measure the X-ray diffraction (XRD) of the samples, all XRD samples were prepared by filtering the solution on the PVDF membrane. The prepared samples were analyzed via SmartLab X-ray diffractometer (Rigaku, Tokyo, Japan) using Cu-Kα source (10° ≤ 2θ ≤ 90°). The dispersion ability of solutions was conducted by using a UV–Vis–NIR spectrometer (V670, Jasco, Seoul, Republic of Korea). The thermal gravimetric analysis (TGA) was conducted to confirm the presence of organic substances on the surface of purified BNNTs. The TGA was performed using the Q-50 model (TA instrument), with a sample mass of 5–10 mg and a heating rate of 10 °C/min under a nitrogen atmosphere.
5
Characterization of SWCNT/Bi2Te3 Composites
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The compositions of the as-prepared SWCNT/Bi2Te3 composites were characterized by X-ray powder diffraction (XRD, D/max 2200PC, Rigaku, Tokyo, Japan). The morphologies of the samples were characterized by high-resolution transmission electron microscopy (HRTEM, Technai G2 F20, FEI, Waltham, MA, USA) and scanning electron microscopy (SEM, Philips PW6800/70, Philips, Amsterdam, The Netherlands). The Seebeck coefficient and electrical conductivity were measured simultaneously from 300 to 360 K by an MRS-3L thin-film thermoelectric test system (Wuhan Giant Instrument Technology Co., Ltd., Wuhan, China) in a low-vacuum atmosphere (≤40 Pa). The instrument test errors are 6% and 5% for the Seebeck coefficient and electrical conductivity, respectively. The thicknesses of the samples were measured by a helical micrometer (Links 150-0.01, Links, Harbin, China). By calculating the ratios of measured density/theoretical density of the SWCNT/Bi2Te3 bulk materials, the corresponding relative density of the as-prepared sample was obtained. The densities of Bi2Te3 and SWCNTs used for calculating the theoretical density of the SWCNT/Bi2Te3 bulk materials were 7.86 [22 (link)] and 2.1 g/cm3 (from the manufacturer), respectively.
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