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Magnetic composite particles and preparation method and application thereof

A technology of magnetic composite particles and magnetic beads, applied in the field of nanomaterials, can solve the problems of limited SERS enhancement effect and no SERS, and achieve the effects of good magnetic response capability, strong versatility, and good SERS performance.

Active Publication Date: 2017-05-10
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, the characteristic of this type of core-shell satellite structure SERS-enhanced substrate is that the magnetic core has no SERS-enhancement ability, but only acts as a magnetic core. The SERS enhancement is guaranteed by the noble metal nanoparticles connected to the periphery, and the SERS enhancement effect is limited.

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  • Magnetic composite particles and preparation method and application thereof
  • Magnetic composite particles and preparation method and application thereof
  • Magnetic composite particles and preparation method and application thereof

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Embodiment 1

[0062] A magnetic composite particle (specifically AgMNP-AuNRs) of the present invention, the magnetic composite particle is a core-shell satellite structure, including silver-shell magnetic beads and gold nanorods, the silver-shell magnetic bead is the magnetic core of the magnetic composite particle, and the silver-shell magnetic bead is the magnetic core of the magnetic composite particle. The surface of the magnetic bead is combined with gold nanorods through poly(2-vinylpyridine), and the silver-shell magnetic bead is composed of manganese ferrite and silver shell continuously coated on the manganese ferrite.

[0063] In this embodiment, the magnetic saturation value of the magnetic composite particle is 31.1emu / g, the magnetic inner core is a superparamagnetic silver shell magnetic bead, and the particle diameter is 360nm, wherein the particle diameter of the manganese ferrite is 300nm, and the silver shell The thickness of the silver shell magnetic beads is 30nm, and the...

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Abstract

The invention discloses magnetic composite particles and a preparation method and application thereof. The magnetic composite particles are of a core-shell satellite structure, the magnetic composite particles are prepared from silver-shell magnetic beads and gold nanorods, and the surfaces of the silver-shell magnetic beads are combined with the gold nanorods with poly(2-vinylpyridine); the silver-shell magnetic beads are composed of manganese ferrite and silver shells continuously wrapping the manganese ferrite. The preparation method of the magnetic composite particles comprises the steps that 1, the silver-shell magnetic beads are added into a poly(2-vinylpyridine) solution, ultrasonic treatment is conducted, and the poly(2-vinylpyridine) modified silver-shell magnetic beads are obtained; 2, a gold nanorod solution is prepared; 3, the poly(2-vinylpyridine) modified silver-shell magnetic beads and the gold nanorod solution are mixed, an ultrasonic reaction is conducted, the magnetic composite particles are obtained, and the magnetic composite particles can serve as an SERS reinforced substrate for detection application. The magnetic composite particles have the very good magnetic response capability and SERS property, and the preparation method is simple in technology, high in universality and high in applicability.

Description

technical field [0001] The invention belongs to the field of nanomaterials and relates to a magnetic composite particle and its preparation method and application, in particular to a core-shell satellite structure magnetic composite particle (AgMNP-AuNRs) and its preparation method and application. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS) is a very important vibrational spectroscopy that can be applied to the detection of trace amounts of small molecules because the nanoscale rough metal surface has a huge Raman enhancement effect on the probe molecules adsorbed on it. analytical skills. Based on its high sensitivity and fingerprint identification characteristics, SERS has been applied in many fields. The key to the application of SERS and even its role in clinical diagnosis in the future lies in the controllable preparation of high-performance SERS-enhanced substrates. [0003] A SERS "hot spot" will be formed at the nanogap with a scale of...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F1/02B22F9/24B82Y40/00B82Y25/00G01N21/65
CPCG01N21/658B82Y25/00B82Y40/00B22F9/24B22F1/07B22F1/17
Inventor 董培涛吴学忠王俊峰王朝光陈剑曾学盛张晨煜
Owner NAT UNIV OF DEFENSE TECH
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