Preparation method and application of molybdenum oxide quantum dots with adjustable optical properties
A technology of optical properties and molybdenum oxide, which is applied in the field of combining nanomaterials and analytical chemistry, can solve the problems of no long-wave luminescence characteristics, uncontrollable size and morphology of molybdenum oxide materials, and achieve the effect of low cost and extended application fields.
Active Publication Date: 2020-09-22
YANGTZE NORMAL UNIVERSITY
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[0004] In view of the above-mentioned deficiencies existing in the prior art, the purpose of the present invention is to provide a preparation method of molybdenum oxide quantum dots with adjustable optical properties, to solve the problem of prior art preparation The size and shape of molybdenum oxide materials are uncontrollable and do not have long-wave luminescence characteristics
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[0035] Example: Sodium phosphomolybdate hydrate, cysteine and ammonia water are fully mixed in water at a molar ratio of 1:41.25:650, wherein 925mL of water needs to be added to every mmol of sodium phosphomolybdate hydrate, and The above solutions were thoroughly mixed under ultrasound, and then transferred to a microwave reactor at 160-180°C for heating and reaction for 5-40 minutes in order to obtain molybdenum oxide quantum dots with different particle sizes, such as figure 2 shown. After natural cooling, centrifuge twice at 14000r / min, each time for 8min, to remove large particles. Then dialysis was carried out for 72 hours in a dialysis bag with a molecular cut-off of 1KD to remove unreacted substances.
[0036] Table 1 Molybdenum oxide quantum dots with different particle sizes obtained under different heating conditions in Examples 1-4
[0037]
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Abstract
The invention discloses a preparation method and application of molybdenum oxide quantum dots with adjustable optical properties. The preparation method comprises the following steps: adding sodium phosphomolybdate hydrate, cysteine and ammonia water into water, fully mixing under ultrasonic conditions to obtain a mixed solution, transferring the mixed solution into a microwave reaction kettle, carrying out microwave heating reaction, naturally cooling, centrifuging to remove large particles, and dialyzing to remove unreacted substances, thereby obtaining the molybdenum oxide quantum dots withadjustable optical properties. The preparation method has the characteristics of rapidness and high efficiency; the particle size of the synthesized molybdenum oxide quantum dots can be controlled bycontrolling the microwave heating time; therefore, the regulation and control on the emission wavelength are realized; and nitrogen and phosphorus elements are doped, edge emission traps of the nanomaterial are increased, and fluorescence emission of the nano material is expanded to a longer green light wavelength region, and thus the molybdenum oxide quantum dot with green emission wavelength is obtained, the content of permanganate and captopril can be sensitively and efficiently detected at low cost, and the application field of the molybdenum oxide quantum dot is expanded.
Description
technical field [0001] The invention relates to the technical field of combining nanomaterials and analytical chemistry, in particular to a preparation method and application of molybdenum oxide quantum dots with adjustable optical properties. Background technique [0002] Molybdenum oxide (MoO x ) Nanomaterials, as a typical transition metal oxide (TMO) material, have become exciting new materials with their excellent physical and chemical properties, especially MoO x Promising tunable localized surface plasmon resonance (LSPR) has been shown in the near-infrared (NIR) and visible regions, and its applications are expanding due to its light-harvesting ability at the nanoscale. This has promoted its application development in the fields of catalysis, single-molecule spectroscopy, photothermal therapy, and photochromism. On the other hand, when MoO x When the size is less than 10nm (MoO x QDs), which exhibit excellent photoluminescent properties due to quantum confinemen...
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IPC IPC(8): C09K11/68C09K11/70C01G39/02B82Y20/00B82Y30/00G01N21/64
CPCC09K11/68C09K11/70C01G39/02B82Y20/00B82Y30/00G01N21/6428C01P2004/03G01N2021/6439
Inventor 曹海燕石文兵董文飞陈果
Owner YANGTZE NORMAL UNIVERSITY
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