研究目的
To study the optical emission of helical and stretchable SWNT fibers, including the tailoring of emission intensity and stability during repeated large-strain elongation, for applications in wearable electronics and optoelectronic systems.
研究成果
Helical SWNT fibers exhibit uniform and stable light emission under moderate voltages, with tunable intensity via voltage and strain (up to 70%). The emission is reversible during mechanical deformation, demonstrating high stretchability. These fibers have potential applications in wearable electronics, decorative lamps, and miniature heat sources, with good mechanical and optoelectronic properties.
研究不足
The presence of impurities can affect fiber lifetime; higher voltages (>14 V) reduce stability and cause degradation. Energy conversion efficiency in heating tests is limited by heat loss to the environment. Mechanical properties degrade under applied voltage due to Joule heating.
1：Experimental Design and Method Selection:
The study involved designing a light-emitting device with helical SWNT fibers in an argon atmosphere to prevent oxidation. Methods included purification of SWNT fibers using current injection and acid treatment, and characterization using SEM and TEM.
2：Sample Selection and Data Sources:
Purified helical SWNT fibers were prepared from as-grown SWNT films via chemical vapor deposition and dry-spinning. Samples were selected based on uniform helical structure and effective length.
3：List of Experimental Equipment and Materials:
Equipment included digital source meters (Keithley 2636 and 2400), spectral color brightness meter (SRC-200M), SEM (JEOL JSM-6700F), TEM (JEOL JEM-2100), tensile tester (Instron 5943), thermocouple (TM-902C), and DC power source (LODE-STAR LPS605DII). Materials included SWNT fibers, copper clamps, glass tubes, argon gas, and water for heating tests.
4：Experimental Procedures and Operational Workflow:
Fibers were encapsulated in glass tubes with argon flow. Voltages from 6 to 20 V were applied to measure resistance, power, and light intensity. Stretching tests up to 70% strain were conducted at controlled rates. Switching cycles and temperature measurements were performed.
5：Data Analysis Methods:
Data on resistance, current, power, light intensity, and temperature were recorded and analyzed using formulas for power (P=UI), heat absorption (Q1=cmΔT), total energy (Q2=UIt), and efficiency (η=Q1/Q2*100%). Statistical analysis of stability and reversibility was conducted.
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digital source meter
Keithley 2636
Keithley
Powered the light-emitting device with voltage range -20 to 20 V and measured electrical parameters.
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digital source meter
Keithley 2400
Keithley
Provided constant bias during stretching tests and recorded resistance.
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scanning electron microscopy
JEOL JSM-6700F
JEOL
Characterized the microstructure of purified carbon nanotube fibers.
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transmission electron microscopy
JEOL JEM-2100
JEOL
Revealed the removal of catalyst residue in the fibers.
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spectral color brightness meter
SRC-200M
Tested optical characteristics including radiation brightness, color coordinates, etc.
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single column tester
Instron 5943
Instron
Conducted tensile testing of fibers at a rate of 1 mm min-1.
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thermocouple
TM-902C
Measured temperature changes of the fiber surface.
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DC power source
LODE-STAR LPS605DII
LODE-STAR
Applied voltage for luminescent device tests.
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