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采用化学镀技术在经过敏活处理的诺卡氏菌表面制备微纳米Ni-Fe-P吸波材料.通过SEM(扫描电子显微镜),EDS(能谱仪),XRD(X射线衍射),VSM(振动样品强磁计)对材料形貌、成分、结构及磁性能进行了分析,并探讨了菌体化学镀前处理机理以及装载量对镀层质量、镀液利用率以及磁性能的影响.结果表明:采用敏活一步法可使菌体表面具备化学沉积的条件.随着诺卡氏菌装载量的提高,诺卡氏菌表面镀层粗糙化、球形颗粒增多且分解产物增多,当装载量为80 mL时,镀层的质量以及镀液的利用率最好.装载量的变化对镀层成分的影响不大,当装载量为80 mL时,镀层中Ni,Fe,P的质量分数分别为83.17%,6.12%,10.71%;装载量的变化对镀层的磁性能影响不大且镀层为典型的非晶态结构.采用矢量网络分析仪(VNA)对镀层的电磁参数进行了测量,结果表明:镀层在10～12,15～17 GHz频段具有较好的吸波性能,当吸收剂厚度为2 mm时,反射损耗可达27 dB.
Electroless plating technology was used to prepare micro-nano Ni-Fe-P microwave absorbing materials on the surface of the sensitive Nocardia.The SEM (scanning electron microscopy), EDS (energy dispersive spectrometer), XRD (Vibrating sample magnetometer) was used to analyze the morphology, composition, structure and magnetic properties of the material, and the effects of chemical pretreatment mechanism and loading on plating quality, plating bath utilization and magnetic properties were discussed.Results The results showed that the conditions of chemical deposition on the surface of mycelium could be obtained by the one-step sensitization method.With the increase of the load of Nocardia, the surface coating of Nocardia was roughened, the number of spherical particles increased and the decomposition products increased, 80 mL, the quality of coating and the utilization of plating solution are the best.The variation of loading has little effect on the composition of coating.When the loading is 80 mL, the mass fraction of Ni, Fe, P in the coating is respectively 83.17% , 6.12% and 10.71%, respectively. The change of loading has little effect on the magnetic properties of the coating and the coating is a typical amorphous structure.The electromagnetic parameters of the coating were measured by VNA, and the results showed that the coating In 10 ~ 12, 15 ~ 17 GHz band has a good absorbing performance, When the absorbent thickness is 2 mm, the reflection loss of up to 27 dB.