Dongguan University of Technology

Hongcheng Wang

Ye Liu

Fei Zhou

Yadong Wei

Geng Zhang

Dongxiong Ling

Shaoqiang Zhang

The present disclosure provides a method for trapping molecules with optical fiber tweezers based on phase transition and crystallization and a method for detecting a Raman spectrum of a persistent organic pollutant, belonging to the technical field of surface-enhanced Raman spectroscopy. Based on quite different solubilities of a substance to be detected in different solvents, dissolved phase small molecules to be detected are transformed into large size crystalline phase molecules through the physical process of phase transition and crystallization. Further, effective trapping of molecules to be detected that are not prone to bonding to noble metal nanoparticles in the vicinity of the noble metal nanoparticles can be achieved by combining the physical process of phase transition and crystallization with the physical trapping technique using optical fiber tweezers, so that the sensitivity of surface-enhanced Raman scattering (SERS) spectrum detection is significantly improved.

Method for trapping molecule with optical fiber tweezers based on phase transition and crystallization and method for detecting raman spectrum of persistent organic pollutant

An in-situ photocatalysis monitoring system based on surface-enhanced Raman Scattering (SERS) spectroscopy. The monitoring system may include a Raman excitation light source, a laser coupling lens, a narrow band filter, a total reflection mirror, a dichroic mirror, a focusing coupling lens, a SERS optical fiber probe, a liquid phase photocatalysis reactor, a photocatalytic light source, a Raman collection lens, and a spectrometer. A first furcation part and a second furcation part each extend from one end of a common detection part of the SERS optical fiber probe; an extending end of the first furcation part is coupled with the focusing coupling lens; an extending end of the second furcation part is coupled with the photocatalytic light source; and the other end of the common detection part is arranged inside the liquid phase photocatalysis reactor. Raman excitation light and photocatalytic light may be transmitted on a common channel.

In-situ photocatalysis monitoring system based on surface-enhanced raman scattering spectroscopy

A remote SERS spectrum detection system and a method thereof. The system includes: a pulsed laser light source, configured to emit Raman excitation light; an optical fiber Raman coupling module, configured to couple the Raman excitation light; the optical fiber Raman probe, configured to transmit the Raman excitation light to an object to be measured to generate a SERS signal light, a backscattered SERS signal light being coupled to a monochromator through the optical fiber Raman coupling module; the monochromator, configured to split the backscattered SERS signal light, to obtain backscattered SERS signal lights at different wavelengths; a high-speed photodetector, configured to convert the backscattered SERS signal lights into time-resolved electrical signals; a processor, for analyzing electrical signals, retrieving a SERS spectrum of the remote object to be measured, and controlling automatic scanning of a grating in the monochromator to achieve clock synchronization.

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Dongguan, China

Hongcheng Wang