41results about How to "Growth conditions are easy to control" patented technology

The invention discloses a method for preparing a semipolar AlN template, which includes: inducing AlN or a twin crystal structure during the growth process of AlN, changing the growth orientation of AlN to obtain a semipolar AlN template. Through the method of the present invention, c-plane sapphire or SiC can be directly selected as the substrate instead of r-plane sapphire, so that the stacking faults in the AlN epitaxial layer can be reduced, and the cost is low; or twin structure, can change the growth orientation of AlN from [0001] to this, which makes the growth window wider and the growth conditions easier to control; at the same time, it only needs one-step growth without changing the growth conditions, so that the subsequent AlN can keep along the The growth in the semipolar direction avoids secondary pollution and is beneficial to obtain high-quality semipolar AlN templates.

The invention provides application of photosynthetic bacteria fermentation broth in pesticide and metal combined contamination soil. In the application, the photosynthetic bacteria fermentation broth with the number effective viable bacteria to be between 108 and 1,010 per millimeter is diluted to 10 to 150 times with water; the fermentation broth is uniformly sprayed to degrading bacteria treated soil in dosage of between 10 and 50kg per mu; the earth surface is turned over for about 20 cm after the spraying is completed to ensure that the broth and the soil are sufficiently mixed and the photosynthetic bacteria can degrade residues of carbamic acid ester pesticide in the soil in high efficiency; and simultaneously, the bioavailability of the metal can be reduced to repair the carbamic acid ester pesticide and metal combined contamination soil. The photosynthetic bacteria has wide raw material sources, low price and easily controlled growing condition, can use low molecular organic substances as photosynthetic electron receptor to perform photo heterotrophic growth under anaerobic illuminating condition, can use organic substances as breathing substrate to perform aerobic or heterotrophic growth under dark and aerobic conditions, can carry out the photosynthesis without releasing oxygen, and is suitable for large-scale industrial implementation.

The invention discloses a semipolar AlN template, which has a semipolar exposed surface and contains a twin structure. The semi-polar AlN template of the present invention can be directly formed by selecting c-plane sapphire or SiC as a substrate without requiring r-plane sapphire, which can not only reduce stacking faults in the AlN epitaxial layer, but also has low cost, and its preparation process is simple, The growth conditions are easy to control, and there is no risk of secondary pollution during the growth process, so it has high quality.

The invention relates to a method for preparing a double perovskite magnetoresistive thin film. The preparation method comprises the steps of firstly grinding a double perovskite parent material to particles of which the sizes are less than or equal to 0.2mu m, mixing with acetone and iodine, and dispersing uniformly to obtain a suspension; then respectively connecting a monocrystalline silicon substrate and copper plates to a positive electrode and a negative electrode, carrying out electrophoresis on the suspension under the action of direct current voltage, and depositing a layer of uniform black thin film on the surface of the monocrystalline silicon; finally annealing the black thin film at 1030-1160 DEG C for 3-6 hours to obtain the double perovskite magnetoresistive thin film. According to the invention, the double perovskite magnetoresistive thin film is prepared on the substrate of the monocrystalline silicon by electrophoresis, the growth process of the thin film does not require a vacuum environment, and growth conditions are easy to control. The preparation method has the advantages of simplicity, no need of complex and expensive equipment and low cost. The prepared double perovskite magnetoresistive thin film has high Curie temperature and wide range of applications.