碳纳米管对RGO/CNT-CNP涂层吸光性能的影响

Effect of Carbon Nano Tube on Light-Absorbing Behavior of RGO/CNT-CNP Coating

为获得对可见光到近红外光具有优异吸收性能的吸光涂层,以还原氧化石墨烯(reduced graphene oxide,RGO)作框架、碳纳米颗粒(carbon nano particles,CNP)和碳纳米管(carbon nano tubes,CNT)作附着物,采用高压静电喷涂技术制备了RGO/CNT_(x)-CNP吸光涂层(x为CNT的直径),研究了CNT的直径对RGO/CNT_(x)-CNP涂层形貌和吸光性能的影响。结果表明:RGO/CNP涂层对波长为400~1400 nm的光的平均吸收率为90.5%;加入CNT使RGO以一定角度倾斜堆叠,从而形成具有不同尺寸光学腔的复合结构,RGO/CNT_(x)-CNP涂层的光吸收性能显著改善;随着CNT直径的增大,CNT覆盖RGO框架的面积增加,RGO/CNT_(x)-CNP涂层的表面粗糙度增大,微米级和纳米级光学腔的数量增加,从而涂层的吸光率提高;采用直径为20 nm的CNT制备的RGO/CNT20-CNP涂层具有最佳的吸光性能,对可见光到近红外光的平均吸收率达94.1%。

In order to obtain a light-absorbing coatings having excellent ability to absorb the lights including visible light to near infrared light,RGO/CNT_(x)-CNP coatings(x denotes diameter of CNT)was fabricated by using reduced graphene oxide(RGO)as framework,and carbon nano particles(CNP)and carbon nano tubes(CNT)as attachments by means of a high voltage electrostatic spraying technology,and the effect of CNT diameter on the morphology and light-absorbing behavior of the RGO/CNT_(x)-CNP coating was investigated.The results indicated that(a)average light absorptivity of the RGO/CNP coating to the lights with wavelengths of 400 to 1400 nm reached 90.5%;(b)the addition of CNT made RGOs to incline and pile up at an angle with the result that a complex structure containing different sizes of optical cavities formed in RGO/CNT_(x)-CNP coatings,and its light-absorbing behavior was appreciably improved;(c)as CNT diameter increased,so too did the CNT covered area of RGO framework,the surface roughness of the RGO/CNT_(x)-CNP coating and the number of micro-sized and nano-sized optical cavities,and therefore the ability of coating to absorb the lights was enhanced;and(d)the RGO/CNT20-CNP coating fabricated by 20-mm-diam CNT exhibited the best light-absorbing behavior,and the average absorptivity to the lights ranging from visible light to near infrared lights reached 94.1%.