Reversible Morphology Locking via Metal Infiltration in a Block Copolymer
Reversible Morphology Locking via Metal Infiltration in a Block Copolymer
复制标题
通过嵌段共聚物中的金属渗透实现可逆形态锁定
DOI：
10.1021/acsnano.3c00723
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发表时间：
2023
期刊：
影响因子：
17.1
通讯作者：
Ross, Caroline A.
中科院分区：
文献类型：
--
作者：
Ma, Mingchao;Liu, Runze;Su, Tingyu;Sun, Zehao;Ross, Caroline A.
从金属前体的酸溶液到聚（2-乙烯基吡啶）（P2 VP）的聚苯乙烯-b-P2 VP嵌段共聚物的微域中的金属渗透被示出为在随后的溶剂退火过程中减少溶剂蒸气的吸收，锁定自组装微域的形态。掺入P2 VP中的金属（此处为Pt）的量随着金属前体[PtCl 4]2-和盐酸浓度增加，达到每吡啶单元0.83个Pt原子。然后使用KOH +乙二胺四乙酸二钠盐二水合物（Na 2 EDTA）络合溶液将金属渗出，这恢复了溶剂吸收并解锁了形态。的金属渗透和形态锁定的可逆性证明在一个多阶段的退火过程中，并确认为Fe以及Pt。嵌段共聚物微区形态的可逆锁定和解锁通过允许形态在随后的工艺步骤期间被固定来扩展其用于纳米纤维工艺的效用。
Metal infiltration from an acid solution of a metal precursor into the poly(2-vinylpyridine) (P2VP) microdomains of a polystyrene-b-P2VP block copolymer is shown to reduce the uptake of solvent vapor during a subsequent solvent annealing process, locking the morphology of the self-assembled microdomains. The amount of metal, here Pt, incorporated into the P2VP increases with both metal precursor [PtCl4]2–and hydrochloric acid concentrations, reaching 0.83 Pt atom per pyridine unit. The metal is then exfiltrated using a KOH + ethylenediaminetetraacetic acid disodium salt dihydrate (Na2EDTA) complexing solution, which restores solvent uptake and unlocks the morphology. The reversibility of the metal infiltration and morphology locking is demonstrated in a multistage annealing process and is confirmed for Fe as well as Pt. Reversible locking and unlocking of block copolymer microdomain morphologies expand their utility for nanofabrication processes by allowing the morphology to be fixed during subsequent process steps.