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Magnetic composite particle and its preparation method and application

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

Active Publication Date: 2018-11-13
NAT UNIV OF DEFENSE TECH
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  • Abstract
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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 particle and its preparation method and application
  • Magnetic composite particle and its preparation method and application
  • Magnetic composite particle and its preparation method and application

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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 a magnetic composite particle, a preparation method and application thereof. The magnetic composite particle has a core-shell satellite structure, including silver-shell magnetic beads and gold nanorods. The surface of the silver-shell magnetic beads is combined with gold nanorods through poly(2-vinylpyridine); It consists of a silver shell continuously coated on manganese ferrite. The preparation method of magnetic composite particles includes (1) adding silver-shell magnetic beads to poly(2-vinylpyridine) solution and ultrasonic treatment to obtain poly(2-vinylpyridine)-modified silver-shell magnetic beads; (2) preparing gold Nanorod solution; (3) Mix poly(2-vinylpyridine)-modified silver-shell magnetic beads with gold nanorod solution, and react with ultrasound to obtain magnetic composite particles, which can be used as SERS-enhanced substrates for detection applications. The magnetic composite particle of the invention has good magnetic response capability and SERS performance, and the preparation method is simple in process, strong in versatility and wide 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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Patent Type & Authority Patents(China)
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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