Gilad Barzilay Yuval, Yucknovsky Anna, Amdursky Nadav
Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 3200003, Israel.
Nano Lett. 2024 Feb 14;24(6):1936-1943. doi: 10.1021/acs.nanolett.3c04209. Epub 2024 Jan 30.
Light is an attractive source of energy for regulating stimulus-responsive chemical systems. Here, we use light as a gating source to control the redox state, the localized surface plasmonic resonance (LSPR) peak, and the structure of molybdenum oxide (MoO) nanosheets, which are important for various applications. However, the light excitation is not that of the MoO nanosheets but rather that of pyranine (HPTS) photoacids, which in turn undergo an excited-state proton transfer (ESPT) process. We show that the ESPT process from HPTS to the nanosheets and the intercalation of protons within the MoO nanosheets trigger the reduction of the nanosheets and the broadening of the LSPR peak, a process that is reversible, meaning that in the absence of light, the LSPR peak diminishes and the nanosheets return to their oxidized form. We further show that this reversible process is accompanied by a change in the nanosheet size and morphology.
光作为一种能量源，对于调控刺激响应性化学体系具有吸引力。在此，我们将光用作门控源，以控制氧化钼（MoO）纳米片的氧化还原状态、局域表面等离子体共振（LSPR）峰以及结构，这些对于各种应用都很重要。然而，光激发的并非MoO纳米片，而是吡喃荧光素（HPTS）光酸，其随后会经历激发态质子转移（ESPT）过程。我们表明，从HPTS到纳米片的ESPT过程以及质子在MoO纳米片内的插入触发了纳米片的还原以及LSPR峰的展宽，这一过程是可逆的，也就是说，在无光条件下，LSPR峰减小，纳米片恢复到其氧化形式。我们进一步表明，这一可逆过程伴随着纳米片尺寸和形态的变化。
