Bao Chunyang, Ma Benhua, Liu Jiale, Wu Zhennan, Zhang Hao, Jiang Yi-Jun, Sun Junqi
State Key Laboratory of Supramolecular Structure and Materials, International Joint Research Laboratory of Nano-Micro Architecture Chemistry (NMAC), College of Chemistry, Jilin University , Changchun 130012, People's Republic of China.
Langmuir. 2016 Apr 12;32(14):3393-9. doi: 10.1021/acs.langmuir.6b00335. Epub 2016 Mar 28.
It remains a challenge to fabricate sacrificial films that are stable in most of solvents and can be readily decomposed on demand. Here we report the fabrication of a near-infrared (NIR) light decomposable sacrificial film by layer-by-layer (LbL) assembly of UV-light-decomposable poly((4-(2-bromoethoxy)-5-methoxy-2-nitrobenzyl acrylate) triethylammonium bromide) (PNBA-TEA), poly(sodium 4-styrene-sulfonate) (PSS), branched polyethyleimine (bPEI), and lanthanide-doped upconversion nanoparticles (UCNPs). The [(PNBA-TEA/PSS)*2/(bPEI/UCNPs)*3]*2 films are stable in deposition solutions of various materials and decompose upon NIR light irradiation. In the [(PNBA-TEA/PSS)*2/(bPEI/UCNPs)*3]*2 films, UCNPs can convert NIR light into UV light, which can decompose PNBA-TEA. After immersing the NIR light-irradiated [(PNBA-TEA/PSS)*2/(bPEI/UCNPs)*3]*2 films in 0.1 M aqueous NaHCO3 solution, the disintegration of the entire films occurs because of the repulsive force between the negatively charged photoproduct of PNBA-TEA and PSS. LbL-assembled (PAH/PAA)*50 films deposited on top of the NIR-light-decomposable [(PNBA-TEA/PSS)*2/(bPEI/UCNPs)*3]*2 films can be conveniently released to produce large-area and defect-free (PAH/PAA)*50 free-standing films after NIR light irradiation and subsequent immersion in 0.1 M aqueous NaHCO3 solution. Because of the satisfactory stability and on-demand decomposable property, the [(PNBA-TEA/PSS)*2/(bPEI/UCNPs)*3]*2 films are promising as sacrificial layers for the fabrication of various free-standing films.
制造在大多数溶剂中稳定且能按需快速分解的牺牲膜仍然是一项挑战。在此，我们报告了一种通过逐层（LbL）组装紫外光可分解的聚（（4 - （2 - 溴乙氧基） - 5 - 甲氧基 - 2 - 硝基苄基丙烯酸酯）三乙铵溴化物）（PNBA - TEA）、聚（4 - 苯乙烯磺酸钠）（PSS）、支化聚乙烯亚胺（bPEI）和镧系掺杂上转换纳米粒子（UCNPs）制备近红外（NIR）光可分解牺牲膜的方法。[(PNBA - TEA/PSS)*2/(bPEI/UCNPs)*3]*2膜在各种材料的沉积溶液中稳定，并在近红外光照射下分解。在[(PNBA - TEA/PSS)*2/(bPEI/UCNPs)*3]*2膜中，UCNPs可将近红外光转换为紫外光，从而分解PNBA - TEA。将近红外光照射后的[(PNBA - TEA/PSS)*2/(bPEI/UCNPs)*3]*2膜浸入0.1 M碳酸氢钠水溶液中后，由于PNBA - TEA的带负电光产物与PSS之间的排斥力，整个膜会发生崩解。沉积在近红外光可分解的[(PNBA - TEA/PSS)*2/(bPEI/UCNPs)*3]*2膜顶部的LbL组装（PAH/PAA）*50膜在近红外光照射并随后浸入0.1 M碳酸氢钠水溶液后可方便地释放，以制备大面积且无缺陷的（PAH/PAA）*50独立膜。由于具有令人满意的稳定性和按需分解特性，[(PNBA - TEA/PSS)*2/(bPEI/UCNPs)*3]*2膜有望作为用于制造各种独立膜的牺牲层。
