研究目的
Investigating the use of reduced graphene oxide/maghemite nanocomposite as a sensing layer in a prism-based SPR sensor for the detection of lead ions (Pb2+) in water.
研究成果
The SPR sensor with rGO/γ-Fe2O3 as a sensing layer successfully detected Pb2+ in water with a LOD of 0.3 ppb. The addition of EDC/NHS enhanced the sensor's integrity and performance. The sensor showed good specificity for Pb2+ at concentrations above 1 ppm and is a viable tool for fast, sensitive, and selective detection of Pb2+ in water.
研究不足
The SPR setup had a minimum rotational angle fixed at 0.184°, limiting the detection of small angle shifts. High flow rates in the water circulation design could lead to turbulence and vortex, destabilizing the sensing interaction.
1：Experimental Design and Method Selection:
The SPR setup followed the Kretschmann configuration with a nanocomposite integrated bilayer sensor chip.
2：Sample Selection and Data Sources:
Different concentrations of Pb2+ in DI water were used.
3：List of Experimental Equipment and Materials:
Helium-Neon (HeNe) laser, chopper plate, transverse magnetic polarizer, pinhole, glass prism, rotational stage, photodetector, lock-in amplifier, sputter coater, airbrush, hotplate.
4：Experimental Procedures and Operational Workflow:
The sensing layer was prepared on a microscopic glass slide coverslip, coated with Au and rGO/γ-Fe2O3, then tested with Pb2+ solutions.
5：Data Analysis Methods:
The intensity of the reflected laser beam was detected and analyzed using Matlab software.
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Photodetector
PDA100A
Thorlabs
Detects the reflected laser beam
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Lock-in amplifier
SR530
Stanford Research
Amplifies the detected signal
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Rotational stage
SGSP-60YAW
Sigma Koki
Controls the incident angle of the laser beam
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Helium-Neon (HeNe) laser
Light source for the SPR setup
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Chopper plate
Modulates the light beam
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Transverse magnetic polarizer
Polarizes the light beam
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Pinhole
Controls the light beam size
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Glass prism
Couples the light beam into the SPR setup
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Motor controller
NM 3000
Newport
Controls the rotational stage
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Sputter coater
K575X
Quorum Technologies
Deposits Au layer onto the coverslip
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Airbrush
Coats the rGO/γ-Fe2O3 solution onto the coverslip
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Hotplate
Heats the coverslip during coating
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