研究目的
To design and synthesize a pillar[5]arene derivative with biphenylcarboxylic acid groups for volatile organic compound sensing, fabricate Langmuir-Blodgett thin films, and characterize their sensing properties using SPR and QCM techniques.
研究成果
The P5-BPCA LB thin film exhibits high sensitivity and selectivity to chloromethane vapor, with reproducible and reversible responses. The film's properties, such as thickness and mass deposition, are well-characterized, and it shows potential for VOC sensing applications due to its host-guest interactions and diffusion behavior.
研究不足
The study is limited to specific organic vapors (haloalkanes and aromatic hydrocarbons) and room temperature conditions. The LB film fabrication and sensing performance may be affected by environmental factors, and the selectivity is primarily towards chloromethane.
1：Experimental Design and Method Selection:
The study involved synthesizing P5-BPCA, preparing LB thin films on gold-coated glass and quartz crystal substrates, and using SPR and QCM techniques to characterize the films and their responses to various organic vapors. Fick's law of diffusion was applied to analyze swelling behavior.
2：Sample Selection and Data Sources:
Samples included synthesized P5-BPCA, organic vapors (haloalkanes and aromatic hydrocarbons), and substrates (gold-coated glass and quartz crystals). Data were acquired from SPR and QCM measurements.
3：List of Experimental Equipment and Materials:
Equipment included a Nima Technology model 622 LB trough, BIOSUPLAR 6 Model 321 SPR Spectrometer, QCM with 3.5 MHz quartz crystals from GTE SYLVANIA, Varian 400 MHz NMR, TruSpec Elemental Analyzer, Bruker FTIR, Zeiss EVO LS10 SEM, Krüss FM40Mk2 contact angle instrument, NT-MDT AFM NTEGRA Solaris. Materials included various chemicals from Sigma-Aldrich, Merck, Acros, and TCI.
4：5 MHz quartz crystals from GTE SYLVANIA, Varian 400 MHz NMR, TruSpec Elemental Analyzer, Bruker FTIR, Zeiss EVO LS10 SEM, Krüss FM40Mk2 contact angle instrument, NT-MDT AFM NTEGRA Solaris. Materials included various chemicals from Sigma-Aldrich, Merck, Acros, and TCI. Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Synthesis of P5-BPCA, LB film deposition at 18 mN m?1 surface pressure, SPR and QCM measurements with cyclic exposure to vapors and dry air, data analysis using Winspall software and Sauerbrey equation.
5：Data Analysis Methods:
Data were analyzed using Fresnel theory for thickness calculation, Sauerbrey equation for mass change, Fick's law for diffusion coefficients, and statistical methods for sensitivity and detection limits.
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FTIR Spectrometer
Bruker Fourier Transform Infrared FTIR (ATR)
Bruker
Used for infrared spectroscopy to identify functional groups in compounds.
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SEM
Zeiss EVO LS10
Zeiss
Used for scanning electron microscopy to observe surface morphology of thin films.
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LB trough
622
Nima Technology
Used for depositing Langmuir-Blodgett thin films by compressing and transferring monolayers onto substrates.
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SPR Spectrometer
BIOSUPLAR 6 Model 321
Used for surface plasmon resonance measurements to characterize thin film thickness and monitor kinetic responses to vapors.
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Quartz Crystal Microbalance
3.5 MHz
GTE SYLVANIA
Used to measure mass changes on the quartz crystal surface due to vapor adsorption and desorption.
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NMR Spectrometer
Varian 400 MHz
Varian
Used for 1H-NMR and 13C-NMR spectroscopy to characterize synthesized compounds.
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Elemental Analyzer
TruSpec
Used for elemental analysis of synthesized compounds.
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Contact Angle Instrument
Krüss FM40Mk2 EasyDrop
Krüss
Used to measure water contact angles on surfaces to assess wetting properties.
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AFM
NT-MDT AFM NTEGRA Solaris
NT-MDT
Used for atomic force microscopy to investigate surface topography of thin films.
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