研究目的
To study the effect of different types of functionalization of single walled carbon nanotubes (SWCNT) with 3-phenylcoumarin derivatives on the chemiresistive sensor response to ammonia (10–50 ppm).
研究成果
The 3D hybrid and the hybrid obtained by covalent functionalization exhibit 2 and 4 times higher sensor responses to ammonia compared to noncovalently functionalized SWCNT. The value of sensor response is in good correlation with the degree of functionalization of SWCNTs with coumarin molecules.
研究不足
The study is limited to the functionalization of SWCNTs with 3-phenylcoumarin derivatives and their sensor response to ammonia. The effect of other functional groups or analytes was not investigated.
1：Experimental Design and Method Selection:
The study involved covalent and noncovalent functionalization of SWCNT with 3-phenylcoumarin derivatives. Covalent functionalization was performed using the Huisgen reaction of azide-alkyne 1,3-dipolar cycloaddition. Noncovalent functionalization was achieved by adsorption of coumarin derivatives on SWCNT surface.
2：Sample Selection and Data Sources:
SWCNTs were functionalized with 3-phenylcoumarin derivatives. The hybrids were characterized by FT-IR, Raman, UV-vis spectroscopies, X-ray photoelectron spectroscopy, and thermogravimetric analysis.
3：List of Experimental Equipment and Materials:
Perkin ElmerSpectrum 100 spectrophotometer, LabRAM Horiba single spectrometer with a CCD Symphony detector, SPECS Surface Nano Analysis GmbH photoelectron spectrometer, Shimadzu UV-Vis-3101 spectrophotometer, FEI-Nova scanning electron microscope, NETZSCH TG 209 F1 thermogravimetric analyzer.
4：Experimental Procedures and Operational Workflow:
The hybrids were prepared by covalent and noncovalent methods, characterized by various spectroscopic techniques, and their sensor responses to ammonia were measured.
5：Data Analysis Methods:
The sensor response was calculated as S=(Ri–R0)/R0, where Ri is the current layer resistance at the detected concentration of the analyte and R0 is the initial resistance.
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Perkin ElmerSpectrum 100 spectrophotometer
Spectrum 100
Perkin Elmer
Used for FT-IR spectroscopy to characterize the hybrid materials.
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Shimadzu UV-Vis-3101 spectrophotometer
UV-Vis-3101
Shimadzu
Used for UV-vis spectroscopy to measure the optical absorption of the hybrids.
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FEI-Nova scanning electron microscope
FEI-Nova
FEI
Used for SEM to investigate the morphology of the hybrid layers.
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LabRAM Horiba single spectrometer
LabRAM Horiba
Horiba
Used for Raman spectroscopy to analyze the hybrid materials.
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SPECS Surface Nano Analysis GmbH photoelectron spectrometer
PHOIBOS-150
SPECS
Used for X-ray photoelectron spectroscopy to study the surface chemistry of the hybrids.
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NETZSCH TG 209 F1 thermogravimetric analyzer
TG 209 F1
NETZSCH
Used for thermogravimetric analysis to determine the functionalization degree of the hybrids.
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