CN105152215B - Preparation method for Au nanometer particle modified flower-ball-shaped molybdenum disulfide with three-dimensional hierarchical structure - Google Patents

Preparation method for Au nanometer particle modified flower-ball-shaped molybdenum disulfide with three-dimensional hierarchical structure Download PDF

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CN105152215B
CN105152215B CN201510418712.XA CN201510418712A CN105152215B CN 105152215 B CN105152215 B CN 105152215B CN 201510418712 A CN201510418712 A CN 201510418712A CN 105152215 B CN105152215 B CN 105152215B
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hierarchical structure
molybdenum disulfide
dimensional hierarchical
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ball
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CN105152215A (en
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闫慧慧
宋鹏
王�琦
杨中喜
张苏
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University of Jinan
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Abstract

The invention provides a preparation method for an Au-modified flower-ball-shaped molybdenum disulfide microsphere with a three-dimensional hierarchical structure, belonging to the technical field of preparation technology of inorganic advanced nanometer materials. The Au-modified flower-ball-shaped molybdenum disulfide with the three-dimensional hierarchical structure is synthesized by reaction at room temperature with chloroauric acid, sodium borohydride, L-lysine and prepared molybdenum disulfide as raw materials. A preparation method concretely comprises the following steps: dispersing the prepared molybdenum disulfide into a certain volume of deionized water, then adding the chloroauric acid and L-lysine in a certain molar ratio, carrying out full mixing, then adding a certain amount of a sodium borohydride solution, and carrying out full mixing under stirring; and after a certain time of reaction at room temperature, carrying out centrifugal separation, washing and drying, then placing an obtained dried sample in a muffle furnace, and carrying out calcining at a certain temperature for a certain time so as to obtain the Au-modified flower-ball-shaped molybdenum disulfide microsphere with the three-dimensional hierarchical structure. The method provided by the invention has the advantages of low cost, simple production process, high yield, no environmental pollution and facilitation to large-scale industrial production. The obtained Au-modified flower-ball-shaped molybdenum disulfide microsphere with the three-dimensional hierarchical structure has regular morphology and can be applied in the fields of chemical catalysis, photocatalyst gas sensors, etc.

Description

A kind of preparation of the nano-particle modified three-dimensional hierarchical structure flower ball-shaped molybdenum bisuphide of au Method
Technical field
The invention belongs to inorganic advanced technical field of nano-composite material preparation technology, more particularly, to au modification three-dimensional hierarchical structure The preparation method of flower ball-shaped mos2 microsphere.
Background technology
Class Graphene molybdenum bisuphide (mos2) by what the single or multiple lift molybdenum bisuphide of hexagonal crystal system formed, there is " Sanming City Control sandwich " compound of layer structure, the three layers of s-mo-s covalent bond being separated by Van der Waals space are tightly packed to be formed, its layer Between Van der Waals space can allow that external reactant carries out insertion reaction, material of main part expands along c crystallographic direction, Cause the change in volume of material.Class Graphene mos2Because of its unique microstructure and reason, change property, overcome zero band gap graphite The shortcoming of alkene still has the lot of advantages of Graphene simultaneously, thus in secondary cell, field-effect transistor, sensor, electroluminescent The various fields such as luminous, electricity storage are gathered around and are had broad application prospects.Different from the Graphene with two-dimensional layered structure, mos2? More stable in the air atmosphere of certain temperature range, therefore, molybdenum bisuphide based composites are in photocatalysis technology, gas sensing Technology will be more of practical significance with fields such as devices.
Jin Yixiang is acknowledged as chemically inert, and it is very weak to the chemical adsorption capacity of oxygen and other gases.From heat From the point of view of amechanical angle, its oxide au2o3It is unstable.Secondly, the electronegativity of gold is more than every other metal, only than sulfur With I slightly more just.And because the standard electrode EMF of au+/au0 is+1.691 v, its affinity to electronics Actually also big than oxygen element, therefore it is to be difficult to oxidation reaction.Finally, due on periodic chart/lanthanide contraction 0 Effect, is less than the silver atoms of the second transition system, its fusing point and enthalpy of sublimation are all than silver positioned at the atomic radius of the gold of the 3rd transition system Height, the interaction force between explanation atom itself is stronger.These characteristics above-mentioned be cause gold chemical reaction ability and The low main cause of catalysis activity.However, reducing with metallic particle diameter, surface atom number increases, the electronics of itself Property will change, thus leading to its chemical and physical features mutation, catalysis activity also increased.In recent years, ground Study carefully scholars and find that golden loaded catalyst can be to photocatalysis, there is excellent performance in the field such as air-sensitive, Xu Jia waits by force (Xu Jia By force, Han Jianjun, Xie Bing, Liu Yun. au-in2o3The performance of co gas sensor and study mechanism. sensing technology journal, 2007,20 (3)) synthesized in chemical precipitation method2o3Nano-particle, its size uniform, dispersibility are preferable, average particle size particle size In 20 ~ 40 nm.When 300 DEG C, 2% gold medal doping has preferable sensitization to oxidation indio co sensor, and to h2Not bright Aobvious sensitization.Catalysis detection of gold etc. has been studied in the world compelling new direction, and relevant new discovery is not Break and emerge in large numbers, and Yang Jianjun etc. (Yang Jianjun, He Panke, Zhang Min, Wang Xiaohui, Yang Dongmei, Jin Zhensheng. Ozone Photocatalytic Au/tio2Catalyst [p]. Chinese patent: cn200510107365.5,2005-12-30) it is prepared for au/tio2Composite wood Material, is suitable for the elimination of ozone in indoor air-purification device.Load type gold catalyst fires to Oxidation of Carbon Monoxide, hydrocarbon catalytic Many important reactions such as burning, epoxidation of propylene, liquid-phase selective oxidation, catalytic hydrogenation reaction all show good catalysis activity, Imply that Au catalyst has broad application prospects.
Research with regard to class graphene-structured molybdenum bisuphide/gold nano grain composite is all at home and abroad just to have risen Step, and Wang Xinhuan etc. (Wang Xinhuan, Han Qiusen, Yang Rong, Wang Chen. a kind of molybdenum bisuphide/gold nanorods composite, preparation side Method and purposes [p]. Chinese patent: cn201410815045.4,2014-12-23) prepare molybdenum bisuphide/gold nanorods Composite, gold nanorods are in 30 nm, and point out for photo-thermal therapy.However, the research report of other correlations is seldom. Therefore, explore smaller size of gold grain load-type composite material and its application is one and is worth making great efforts the direction of research.
Content of the invention
It is an object of the invention to provide a kind of preparation method of molybdenum bisuphide/gold nano grain, this method production technology Simply, yield is high, and non-environmental-pollution has good scientific research prospect and using value.Gained molybdenum bisuphide/gold nano grain shape Looks are regular, can be used for the fields such as chemical industry catalysis, photocatalysis, gas sensor.
The technical scheme is that and a certain amount of molybdenum disulfide powder is distributed in the deionized water of certain volume, The chlorauric acid solution of certain mol proportion, l- lysine solution and sodium borohydride solution is added to be sufficiently mixed, normal-temperature reaction one timing Between, centrifugation, washing, it is dried, in the air is placed in heat treatment under uniform temperature in Muffle furnace and can get three-dimensional point of au modification Level structure flower ball-shaped mos2 microsphere.
Concrete synthesis step is as follows:
(1) 0.01 m chlorauric acid solution, the l- lysine solution of 0.01 m and 0.1 m sodium borohydride solution are prepared;
(2) the molybdenum disulfide powder ultrasonic disperse preparing 0.01-0.1 g is in 10-50 ml deionized water;
(3) 1-5 ml chlorauric acid solution and 1-5 ml l- lysine solution are added in the solution in step (2), wherein, Gold chloride and sodium borohydride solution obtain mol ratio for 1:1, magnetic agitation 10-30 min;It is added dropwise over 0.1-1.0 ml hydroboration Sodium solution, magnetic agitation 10-30 min;
(4) reacted product is carried out solid-liquid separation with centrifuge, and deionized water and ethanol produce to gained solid Thing is repeatedly washed;
(5) step (4) gained solid product is positioned in drying baker, 60 DEG C are dried 5-10 hour, are subsequently placed in Muffle In stove, heat treatment 30 min-120 min at 300 DEG C, obtain au and modify three-dimensional hierarchical structure flower ball-shaped mos2 microsphere.
After the present invention adopts technique scheme, mainly have the following effects:
(1) present invention each step in preparation process does not produce poisonous and harmful substance, is conducive to environmental conservation, and The hydro-thermal reaction time is short, efficiency high;
(2) the inventive method is simple, easy to operate, the plant-scale equipment simple it is easy to industrialization large-scale production;
(3) au of present invention preparation modifies three-dimensional hierarchical structure flower ball-shaped mos2 microsphere regular appearance, specific surface area Big and gold grain particle diameter is little, it is uniformly dispersed, can be used for the fields such as chemical industry catalysis, photocatalyst gas sensor.
Brief description
Fig. 1 is the x-ray diffraction collection of illustrative plates of three-dimensional hierarchical structure flower ball-shaped mos2 microsphere in embodiment 1
Fig. 2 is the fesem figure of three-dimensional hierarchical structure flower ball-shaped mos2 microsphere in embodiment 1
Fig. 3 is the x-ray diffraction collection of illustrative plates that in embodiment 1, au modifies three-dimensional hierarchical structure flower ball-shaped mos2 microsphere
Fig. 4 is the fesem figure that in embodiment 1, au modifies three-dimensional hierarchical structure flower ball-shaped mos2 microsphere
Fig. 5 is the eds energy spectrum diagram that in embodiment 1, au modifies three-dimensional hierarchical structure flower ball-shaped mos2 microsphere
Fig. 6 is the fesem figure that in embodiment 2, au modifies three-dimensional hierarchical structure flower ball-shaped mos2 microsphere
With specific embodiment, the present invention is described in further detail below in conjunction with the accompanying drawings.
Specific embodiment
Embodiment 1
(1) 0.01 m chlorauric acid solution, the l- lysine solution of 0.01 m and 0.1 m sodium borohydride solution are prepared;
(2) the molybdenum disulfide powder ultrasonic disperse preparing 0.05 g is in 15 ml deionized waters;
(3) 1.5 ml chlorauric acid solutions and 1.5 ml l- lysine solutions are added in the solution in step (2), wherein, Gold chloride and sodium borohydride solution obtain mol ratio for 1:1, magnetic agitation 20 min;It is added dropwise over 0.2 ml sodium borohydride solution, Magnetic agitation 20 min;
(4) reacted product is carried out solid-liquid separation with centrifuge, and deionized water and ethanol produce to gained solid Thing is repeatedly washed;
(5) step (4) gained solid product is positioned in drying baker, 60 DEG C of dryings 8 hours, is subsequently placed in Muffle furnace In, heat treatment 30 min at 300 DEG C, obtain au and modify three-dimensional hierarchical structure flower ball-shaped mos2 microsphere.
X-ray diffraction pattern collection of illustrative plates such as Fig. 1 institute of three-dimensional hierarchical structure flower ball-shaped mos2 microsphere used in embodiment 1 Show, the position of all diffraction maximums of the xrd collection of illustrative plates of sample is consistent with international standard card pdf#65-0160, show used Sample is exactly molybdenum bisuphide.Shoot the fesem picture of gained through field emission scanning electron microscope, as shown in Figure 2 it can be seen that The pattern of molybdenum bisuphide is the flower ball-shaped of three-dimensional hierarchical structure, regular appearance.
The X-ray diffraction pattern collection of illustrative plates of the molybdenum bisuphide that embodiment 1 is prepared/gold nano grain three-dimensional hierarchical structure microsphere is such as Shown in Fig. 3, using the position of all diffraction maximums of the xrd collection of illustrative plates of the sample prepared by the present invention and the diffraction of molybdenum bisuphide and gold Peak is consistent, no other miscellaneous peaks, shows that prepared sample is composite molybdenum disulfide/gold nano grain.Scan electricity through Flied emission The fesem picture of sub- microscope photographing gained, as shown in Figure 4 it can be seen that molybdenum bisuphide/gold nano grain three-dimensional hierarchical structure Regular appearance, gold grain a size of 10 below nm and being uniformly dispersed.Result through eds energy-spectrum scanning gained is as shown in figure 5, can To find out the presence of golden (au), molybdenum (mo), three kinds of elements of sulfur (s), and the signal intensity of gold is very high, comprehensive xrd, sem, eds knot Fruit explanation gold grain successfully loads on molybdenum disulfide nano sheet.
Embodiment 2
(1) 0.01 m chlorauric acid solution, the l- lysine solution of 0.01 m and 0.1 m sodium borohydride solution are prepared;
(2) the molybdenum disulfide powder ultrasonic disperse preparing 0.01 g is in 10 ml deionized waters;
(3) 1 ml chlorauric acid solution and 1 ml l- lysine solution are added in the solution in step (2), wherein, chlorine gold Acid and sodium borohydride solution obtain mol ratio for 1:1, magnetic agitation 10 min;It is added dropwise over 0.1 ml sodium borohydride solution, magnetic force Stir 10 min;
(4) reacted product is carried out solid-liquid separation with centrifuge, and deionized water and ethanol produce to gained solid Thing is repeatedly washed;
(5) step (4) gained solid product is positioned in drying baker, 60 DEG C of dryings 5 hours, is subsequently placed in Muffle furnace In, heat treatment 30 min at 300 DEG C, obtain au and modify three-dimensional hierarchical structure flower ball-shaped mos2 microsphere.
Molybdenum bisuphide/the gold nano grain of embodiment 2 preparation is as shown in Figure 6 it can be seen that obtained molybdenum bisuphide/gold Nanoparticle three-dimensional hierarchy is combined good.
Embodiment 3
(1) 0.01 m chlorauric acid solution, the l- lysine solution of 0.01 m and 0.1 m sodium borohydride solution are prepared;
(2) the molybdenum disulfide powder ultrasonic disperse preparing 0.03 g is in 20 ml deionized waters;
(3) 2 ml chlorauric acid solutions and 2 ml l- lysine solutions are added in the solution in step (2), wherein, chlorine gold Acid and sodium borohydride solution obtain mol ratio for 1:1, magnetic agitation 20 min;It is added dropwise over 0.2 ml sodium borohydride solution, magnetic force Stir 20 min;
(4) reacted product is carried out solid-liquid separation with centrifuge, and deionized water and ethanol produce to gained solid Thing is repeatedly washed;
(5) step (4) gained solid product is positioned in drying baker, 60 DEG C of dryings 6 hours, is subsequently placed in Muffle furnace In, heat treatment 60 min at 300 DEG C, obtain au and modify three-dimensional hierarchical structure flower ball-shaped mos2 microsphere.
Embodiment 4
(1) 0.01 m chlorauric acid solution, the l- lysine solution of 0.01 m and 0.1 m sodium borohydride solution are prepared;
(2) the molybdenum disulfide powder ultrasonic disperse preparing 0.08 g is in 30 ml deionized waters;
(3) 3 ml chlorauric acid solutions and 3 ml l- lysine solutions are added in the solution in step (2), wherein, chlorine gold Acid and sodium borohydride solution obtain mol ratio for 1:1, magnetic agitation 30 min;It is added dropwise over 5.0 ml sodium borohydride solutions, magnetic force Stirring 30min;
(4) reacted product is carried out solid-liquid separation with centrifuge, and deionized water and ethanol produce to gained solid Thing is repeatedly washed;
(5) step (4) gained solid product is positioned in drying baker, 60 DEG C of dryings 8 hours, is subsequently placed in Muffle furnace In, heat treatment 30 min at 300 DEG C, obtain au and modify three-dimensional hierarchical structure flower ball-shaped mos2 microsphere.
Embodiment 5
(1) 0.01 m chlorauric acid solution, the l- lysine solution of 0.01 m and 0.1 m sodium borohydride solution are prepared;
(2) the molybdenum disulfide powder ultrasonic disperse preparing 0.1 g is in 50 ml deionized waters;
(3) 5 ml chlorauric acid solutions and 5 ml l- lysine solutions are added in the solution in step (2), wherein, chlorine gold Acid and sodium borohydride solution obtain mol ratio for 1:1, magnetic agitation 30 min;It is added dropwise over 1.0 ml sodium borohydride solutions, magnetic force Stir 30 min;
(4) reacted product is carried out solid-liquid separation with centrifuge, and deionized water and ethanol produce to gained solid Thing is repeatedly washed;
(5) step (4) gained solid product is positioned in drying baker, 60 DEG C of dryings 10 hours, is subsequently placed in Muffle furnace In, heat treatment 120 min at 300 DEG C, obtain au and modify three-dimensional hierarchical structure flower ball-shaped mos2 microsphere.

Claims (1)

1. a kind of au modifies the preparation method of three-dimensional hierarchical structure flower ball-shaped mos2 microsphere, and concrete synthesis step is as follows:
(1) 0.01m chlorauric acid solution, the l- lysine solution of 0.01m and 0.1m sodium borohydride solution are prepared;
(2) the three-dimensional hierarchical structure flower ball-shaped molybdenum disulfide powder ultrasonic disperse that 0.01-0.1g prepares is gone to 10-50 ml In ionized water;
(3) 1-5ml chlorauric acid solution and 1-5 ml l- lysine solution, wherein, chlorine gold are added in the solution in step (2) Acid and sodium borohydride solution obtain mol ratio for 1:1, magnetic agitation 10-30 min;It is added dropwise over 0.1-1.0 ml sodium borohydride molten Liquid, magnetic agitation 10-30 min;
(4) reacted product is carried out solid-liquid separation with centrifuge, and deionized water and ethanol enter to gained solid product Row repeatedly washs;
(5) step (4) gained solid product is positioned in drying baker, 60 DEG C are dried 5-10 hour, are subsequently placed in Muffle furnace In, heat treatment 30 min-120 min at 300 DEG C, obtain au and modify three-dimensional hierarchical structure flower ball-shaped mos2 microsphere.
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