Preparation method of molybdenum oxide quantum dot by one-step method

A technology of molybdenum oxide and quantum dots, which is applied in molybdenum oxide/molybdenum hydroxide, measuring devices, nanotechnology for materials and surface science, etc., to achieve uniform size, strong fluorescent performance, and high stability

Active Publication Date: 2018-04-24
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in order to further study the application and development of molybdenum oxide nanomaterials, it is necessary to adopt a simple and feasible preparation method of molybdenum oxide quantum dots. preparation and research efficiency, but there is no such research report

Method used

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  • Preparation method of molybdenum oxide quantum dot by one-step method
  • Preparation method of molybdenum oxide quantum dot by one-step method
  • Preparation method of molybdenum oxide quantum dot by one-step method

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Embodiment 1

[0020] S1. Weigh 1 g of molybdenum trioxide in 100 mL of dimethyl sulfoxide, and then stir to obtain a milky white suspension solution for later use;

[0021] S2. Ultrasonicate the milky white suspension solution prepared in S1 with a power of 300 watts for 3 hours;

[0022] S3, adding a rotor to the ultrasonicated solution in S2, and stirring the solution on a magnetic stirrer at a speed of 260 rpm for 12 hours;

[0023] S4. Take the stirred solution in S3 and put it into a centrifuge tube, centrifuge at a speed of 12,000 rpm for 10 minutes, and take the supernatant after solid-liquid separation, which is the molybdenum oxide quantum dot solution.

[0024] The molybdenum oxide quantum dot solution prepared in this example is measured, the quantum dot particles prepared in this example are uniform and less than 8nm, the average size is 3.25nm, and the quantum yield is 3.85%, which proves that the present invention can reliably and stably prepare molybdenum oxide quantum dots ...

Embodiment 2

[0026] In this embodiment, the molybdenum oxide quantum dots prepared in Example 1 have been tested for fluorescence properties, as image 3 (B) shows that the maximum excitation wavelength is located at 436 nm in the case of the optimal excitation wavelength of 350 nm.

Embodiment 3

[0028] The molybdenum oxide quantum dots prepared in Example 1 can be specifically quenched by ferric iron, so the prepared molybdenum oxide quantum dots can be applied to the specific and sensitive detection of ferric iron and pyrophosphate anion content, The result is as Figure 4 As shown, when the concentration of ferric ions increases from 0 to 1400 micromole per liter, the corresponding fluorescence intensity is as Figure 4 As shown in (A); when the concentration of ferric iron is in the range of 100 to 260 micromole per liter, the fluorescence intensity and ferric iron present a linear relationship, such as Figure 4 Shown in (B); Continue to add sodium pyrophosphate solution in solution afterwards, fluorescence intensity record is as follows Figure 4 As shown in (C), when the pyrophosphate ion concentration is between 0 and 60 micromole per liter, the fluorescence intensity has a good linear relationship with the pyrophosphate ion concentration, as shown in 4 (D); t...

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Abstract

The invention belongs to the field of preparation of nanomaterial and fluorescence probe and bacteriostasis, and relates to a preparation method of a molybdenum oxide quantum dot by a one-step method.The method includes steps of weighing fixed quantity of molybdenum oxide in peeling solvent (including but not limiting in dimethyl sulfoxide); stirring to obtain milky suspending solution; performing ultrasound treatment on the milky suspending solution for 2 hours under the condition of more than 280W power; adding a rotor in the suspending solution after ultrasound treatment; then stirring thesolution added with rotor by a magnetic stirrer at the speed of more than 250 r/m for more than 5 hours; finally, adding the stirred solution in a centrifugal pipe; centrifuging at the rotate speed of more than 10000 r/m for more than 5 minutes, and taking liquid supernatant after separation of solid and fluid, so as to obtain the molybdenum oxide quantum dot. The technique process is simple andlow-consumption, and able to reliably and stably prepare the molybdenum oxide quantum dot; the molybdenum oxide quantum dot can be used as a fluorescence probe and can detect ferric ion and pyrophosphate anion at fixed amount in real time.

Description

Technical field: [0001] The invention belongs to the field of preparation of nanomaterials and its use in fluorescent probes and antibacterial, and relates to a method for preparing a molybdenum oxide quantum dot in one step, in particular to a molybdenum oxide quantum dot synthesized by a stirring method using molybdenum trioxide as a raw material. Molybdenum quantum dots do not add any surfactant or template, and simultaneously apply molybdenum oxide quantum dots to the fields of fluorescence detection and antibacterial. Background technique: [0002] At present, molybdenum oxide material, as a new type of transition metal oxide, can be used as a raw material for preparing ferromolybdenum and molybdenum compounds, and can also be directly added to molybdenum alloys as a molybdenum element additive to improve the properties of the alloy. Molybdenum oxide has unique physical properties (including photochromism, electrochromism, gas sensitivity, etc.), therefore, transition m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/02B82Y30/00G01N21/64
CPCB82Y30/00C01G39/02C01P2004/04C01P2004/64G01N21/6428G01N2021/6432
Inventor 牛玉生袁莉莉许元红
Owner QINGDAO UNIV
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