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Although significant efforts have been devoted to controlling the light\u2010triggered morphological transformation of BCP particles, precisely modulating their morphologies using visible light remains a formidable challenge. Herein, we fabricated the light\u2010responsive polystyrene\u2010\n                    <jats:italic>b<\/jats:italic>\n                    \u2010poly(4\u2010vinylpyridine) (PS\u2010\n                    <jats:italic>b<\/jats:italic>\n                    \u2010P4VP) nanosheets via emulsion\u2010confined assembly in a spiropyran photoacid (SPPA) solution. Upon exposure to visible light, the non\u2010porous nanosheets gradually transformed into porous nanosheets with hexagonally arrayed P4VP cylindrical pores, attributed to proton release from SPPA photoisomerization under irradiation and subsequent pH\u2010dependent switching of P4VP cylindrical channels. Besides, owing to the reversibility of SPPA photoisomerization, the resulting porous nanosheets can revert to the non\u2010porous nanosheets in the dark. Furthermore, nanosheets with a controlled pore structure can serve as templates for the in situ deposition of gold nanoparticles (AuNPs), yielding hybrid PS\u2010\n                    <jats:italic>b<\/jats:italic>\n                    \u2010P4VP\/AuNPs nanosheets with tunable porosity. The hybrid nanosheets can be used as catalysts for the reduction of 4\u2010nitrophenol, and the porous nanosheets exhibited greater catalytic efficiency than the non\u2010porous nanosheets. Thus, the reversible morphological transition of BCP particles can be precisely modulated by visible\u2010light stimulus and BCP particles can function as scaffolds for constructing hybrid BCP\/NPs particles with adjustable catalytic efficiency, thereby broadening their application.\n                  <\/jats:p>","DOI":"10.1002\/smll.73612","type":"journal-article","created":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T08:57:16Z","timestamp":1777625836000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Light\u2010Responsive Block Copolymer Nanosheets With Well\u2010Ordered and Switchable Channels"],"prefix":"10.1002","volume":"22","author":[{"given":"Xin","family":"Yu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Polymer Science and Technology Changchun Institute of Applied Chemistry Chinese Academy of Sciences  Changchun China"},{"name":"School of Applied Chemistry and Engineering 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