研究目的
To develop a scalable method for preparing pristine 2D As nanosheets via direct liquid exfoliation in organic and aqueous solvents and to investigate their application in selective vapor sensing.
研究成果
The study successfully demonstrated the liquid-phase exfoliation of arsenic crystals into few-layered nanosheets with high quality and stability. The exfoliated arsenene nanosheets showed selective and sensitive detection of methanol and acetone vapors, indicating their potential for semiconductor applications. The findings suggest that further development could facilitate the use of FL-As in a broad range of applications.
研究不足
The study demonstrates the potential of 2D arsenene for vapor sensing but notes the material's proneness to oxidation, which could affect long-term stability and performance in practical applications.
1：Experimental Design and Method Selection:
The study employed a liquid-phase exfoliation (LPE) procedure assisted by sonication without any additional surfactant to prepare few-layered arsenene. The exfoliation process was performed in various solvents to identify the optimal conditions for stable arsenene sheets.
2：Sample Selection and Data Sources:
Bulk arsenic crystals were used as the starting material. The exfoliation was performed in organic and aqueous solvents, with N-methylpyrrolidone identified as the optimal solvent.
3：List of Experimental Equipment and Materials:
A sealed-tip ultrasonication system (BANDELIN SONOPULS HD 3200 – 30 W max) was used for exfoliation. Characterization techniques included AFM, XRD, HRTEM, and Raman spectroscopy.
4：Experimental Procedures and Operational Workflow:
The exfoliation process involved sonication of bulk arsenic in various solvents, followed by centrifugation to isolate well-exfoliated 2D As nanosheets. The resulting nanosheets were characterized and used to fabricate a vapor sensor.
5：Data Analysis Methods:
The performance of the vapor sensor was evaluated using electrochemical impedance spectroscopy (EIS) to study the change in electronic properties upon adsorption of different gaseous species.
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Flex-Axiom Nanosurf
Tap190AI-G – 190 kHz resonance frequency
Nanosurf
Used for capturing AFM images of the exfoliated As nanosheets.
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BANDELIN SONOPULS HD 3200
30 W max
BANDELIN
Used for the exfoliation of bulk arsenic crystals into few-layered nanosheets.
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Whatman Anodisc 25
0.02 μm pore size
Whatman
Used for filtering the exfoliated As nanosheets solution.
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Bruker D8 Discoverer
Bruker
Used for X-ray powder diffraction data collection.
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Tescan Lyra dual beam microscope
Tescan
Used for investigating the morphology of bulk crystals of arsenic.
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EFTEM Jeol 2200 FS microscope
Jeol
Used for HRTEM measurements.
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inVia Raman microscope
Renishaw
Used for Raman spectroscopy and photoluminescence measurement.
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Zetasizer Nano ZS
Malvern
Used for dynamic light scattering (DLS) measurements.
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Autolab PGSTAT 302 V
Metroohm
Used for electrochemical characterization via EIS.
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