研究目的
To differentiate tertiary amines from primary and secondary amines using active ester-functionalized hexabenzoperylene in field effect transistors.
研究成果
The study successfully demonstrates that active ester-functionalized HBP enables differentiation of tertiary amines from primary and secondary amines in water-based OFET sensors, leveraging the non-reactivity of tertiary amines with active esters. This provides a selective sensing platform with potential applications in environmental monitoring and diagnostics.
研究不足
The sensor is limited to aqueous environments and specific amine concentrations (0.2 mM tested); it may not detect amines in other solvents or at different concentrations. The reaction with amines is irreversible, preventing sensor reuse. Thermal stability is a concern due to potential isomerization of HBP at elevated temperatures.
1：Experimental Design and Method Selection:
The study involved synthesizing ester-functionalized HBPs, characterizing their self-assembly in crystals and thin films, and integrating them into OFET-based sensors with microfluidic channels for amine detection. Theoretical models include π-stacking interactions and chemical reactivity of active esters with amines.
2：Sample Selection and Data Sources:
Samples included synthesized compounds 1 and 2, and analytes such as n-hexylamine, phenethylamine, diethylamine, piperidine, triethylamine, pyridine, and ammonia in aqueous solutions at 0.2 mM concentration.
3：2 mM concentration.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included X-ray crystallography setup, dip-coating apparatus, UV-vis spectrophotometer, XRD machine, AFM, OFET fabrication tools (e.g., vacuum deposition for gold electrodes), microfluidic channels made of PDMS, syringe pump. Materials included silicon substrates with composite dielectric (titanium oxide, alumina, MODPA), solvents like dichloromethane and ethyl acetate, and various amines.
4：Experimental Procedures and Operational Workflow:
Synthesis of HBPs via Scholl and Diels-Alder reactions; crystal growth for 1; dip-coating of thin films of 2 on substrates; fabrication of top-contact OFETs with gold electrodes; integration with PDMS microfluidic channels; exposure to amine solutions; measurement of electrical properties (drain current, transfer curves) and characterization (UV-vis, XRD, AFM).
5：Data Analysis Methods:
Analysis of XRD patterns for d-spacing, UV-vis spectra for absorption shifts, AFM for film thickness, and electrical measurements (mobility, current changes) using statistical methods for averages and standard deviations.
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