Zhongyu Liu, Xiaolei Hu, Lianshun Luo, Guiying He, Abhrojyoti Mazumder, Ece Gunay, Yitong Wang, Elizabeth C. Dickey, Linda A. Peteanu, Krzysztof Matyjaszewski and Rongchao Jin*,
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Near-Infrared to Visible Photon Upconversion with Gold Quantum Rods and Aqueous Photo-Driven Polymerization
Converting near-infrared (NIR) photons into visible light via triplet–triplet annihilation upconversion (TTA-UC) is a promising strategy for advancing energy, biomedical, and materials science. However, the development of efficient NIR sensitizers remains a major challenge. Here, we report an atomically precise gold quantum rod, Au42(PET)32 (PET = 2-phenylethanethiolate), as a high-performance photosensitizer for NIR-to-visible TTA-UC. Paired with TES-ADT as an annihilator, the system exhibits a 6.7% quantum yield, a 0.5 eV anti-Stokes shift, and a low threshold intensity of 90 mW/cm2. To enable aqueous compatibility, the upconversion nanodroplets are encapsulated with a silica shell, yielding Au42/TES-ADT@SiO2 nanoparticles (NPs) capable of driving efficient photoinduced atom-transfer radical polymerization (photo-ATRP) and forming hydrogels in water. This system offers a versatile platform for the next generation photopolymerization with NIR light, solar energy utilization and noninvasive biomedical applications.
期刊介绍：
The flagship journal of the American Chemical Society, known as the Journal of the American Chemical Society (JACS), has been a prestigious publication since its establishment in 1879. It holds a preeminent position in the field of chemistry and related interdisciplinary sciences. JACS is committed to disseminating cutting-edge research papers, covering a wide range of topics, and encompasses approximately 19,000 pages of Articles, Communications, and Perspectives annually. With a weekly publication frequency, JACS plays a vital role in advancing the field of chemistry by providing essential research.
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