研究目的
To develop a flexible, transparent, and highly sensitive ammonia sensor using functionalized single-wall carbon nanotubes on flexible substrates for room-temperature operation.
研究成果
The developed functionalized SWCNT film is a transparent, flexible, and highly sensitive ammonia sensor with good selectivity and performance under bending conditions, suitable for low-cost, disposable, and wearable applications in environmental monitoring.
研究不足
The sensor requires a small external energy (heating to 40°C) for recovery to baseline resistance, and the functionalization process may affect long-term stability or introduce variability. The method is limited to room-temperature operation and may not be suitable for high-temperature environments.
1：Experimental Design and Method Selection:
A wet-chemical process was used to synthesize functionalized SWCNT films on transparency sheets, involving aqua regia treatment for carboxyl group attachment and ascorbic acid reduction. A control film was prepared with PMMA and chloroform for comparison.
2：Sample Selection and Data Sources:
SWCNT powder was used as the starting material; films were deposited on transparency sheets.
3：List of Experimental Equipment and Materials:
Equipment included FTIR microscope (Thermo-Nicolet continuum), FESEM (Supra 40, Carl Zeiss), TEM (H-9000 NAR, Hitachi), spectrophotometer (SPECTRASCAN UV 2600, Chemito), Raman microscope (Renishaw), semiconductor parameter analyzer (Keithly 4200 SCS), mass flow controllers (MKS 247), gas mixer, test chamber, and data acquisition unit (Agilent 34972A LXI). Materials included SWCNTs, aqua regia, ascorbic acid, PMMA, chloroform, acetone, and transparency sheets.
4：Experimental Procedures and Operational Workflow:
SWCNTs were treated with aqua regia, washed, sonicated with ascorbic acid, and deposited on substrates via evaporation. Films were characterized using FTIR, FESEM, TEM, transmittance, Raman, and I-V measurements. Gas sensing involved exposing films to ammonia and other gases in a controlled chamber, measuring resistance changes with the DAQ system.
5：Data Analysis Methods:
Sensor response was calculated as (R_vapour - R_N2)/R_N2 * 100%; data were analyzed for sensitivity, response time, and selectivity using software like BenchLink Data Logger Pro.
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FESEM
Supra 40
Carl Zeiss
Imaging the morphology of SWCNT films to observe network structure.
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TEM
H-9000 NAR
Hitachi
Transmission electron microscopy imaging of SWCNT films.
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Semiconductor Parameter Analyzer
4200 SCS
Keithly
Performing current-voltage (I-V) characteristics measurements.
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Data Acquisition Unit
34972A LXI
Agilent
Real-time data collection of resistance changes during gas sensing.
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FTIR microscope
continuum
Thermo-Nicolet
Characterization of CNT films to verify carboxyl group attachment via FTIR measurements.
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Spectrophotometer
SPECTRASCAN UV 2600
Chemito
Measurement of transmittance and absorbance spectra of the films.
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Raman Microscope
Renishaw
Obtaining Raman spectra to characterize SWCNTs.
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Mass Flow Controller
247
MKS
Controlling gas flow rates in the sensing setup.
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