Near infrared electrochromic variable optical attenuator fabricated by layer-by-layer assembly

Near infrared electrochromic variable optical attenuator fabricated by layer-by-layer assembly
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层层组装近红外电致变色可变光衰减器

DOI:
10.1007/s10118-010-1007-5
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发表时间:
2011
影响因子:
4.3
通讯作者:
Wan, Xin-hua
Wan, Xin-hua
中科院分区:
化学2区
文献类型:
--
作者:
Zheng, Jia;Zheng, Yi-jun;Wan, Xin-hua

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采用n, n -双(对磺基苯基)萘二酰亚胺(Naph-SO3Na)和常见阳离子聚合物聚二烯丙基二甲基铵(PDDA)逐层组装的方法制备了电致变色可变光衰减器(ECVOA)。多层膜的紫外-可见吸收光谱表明,在每个沉积周期中,nph - so3na的组装量大致相等。单电子还原后,多层膜在452nm处有较强的吸收,在1200nm ~ 1900 nm处有较宽的吸收带。由于离子电导率的提高,薄膜在1550 nm处的光衰减响应时间很快,在5 s内达到1.3 dB/μm。这些结果表明,逐层组装是制备在近红外区域工作的ECVOA的有效方法。
An electrochromic variable optical attenuator (ECVOA) was fabricated by layer-by-layer (LBL) assembly of disodiumN,N-bis(p-sulfonatophenyl)naphthalenedicarboximide (Naph-SO3Na) and common cationic polymer poly(diallyldimethylammonium) chloride (PDDA). The UV-Vis absorption spectra of the multilayer films revealed that approximately an equal amount of Naph-SO3Na was assembled in each deposition cycle. Upon one-electron reduction, multilayer films exhibited intense absorption around 452 nm and also a broad absorption band from 1200 nm to 1900 nm. Owing to the improved ionic conductivity, the optical attenuation at 1550 nm of the films showed rapid response time and reached 1.3 dB/μm within 5 s. These results indicate that layer-by-layer assembly could be an effective method for the preparation of ECVOA operating in near infrared region.
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