Abstract Introducing novel nanomaterials into azobenzene (AB) and its derivatives enables a remarkable influence on the molecular isomerization and thus is of great interest for a variety of applications. We systematically study the thermal and photoinduced isomerization of p-aminoazobenzene (pAAB) directly anchored on MoS2/GO nanocomposites by employing in-situ and real-time surface-enhanced Raman scattering (SERS) spectroscopy. The MoS2/GO nanocomposite provides the enhancements for the thermal isomerization efficiency of pAAB of more than 3-fold compared with that of the bare pAAB. We also show that the MoS2/GO nanocomposite has little impact on the UV-induced isomerization of the pAAB, but has apparent impact on the reverse cis-to-trans isomerization of the pAAB under blue light illumination. The results reveal that the effect of MoS2/GO nanocomposite on the photoinduced isomerization of pAAB depends on irradiation wavelength, which can be attributed to the competing interplay of charge transfer and structural relaxation in the hybrid system composed of pAAB and MoS2/GO nanocomposites. The study helps elucidate how the isomerization of azobenzene molecules is affected as incorporated into nanoscale assemblies, and thus open new opportunities for the applications of the isomerization of azobenzene in complex hybrid nanodevices.

中文翻译：

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直接锚定在二硫化钼/氧化石墨烯纳米复合材料上的对氨基偶氮苯的异构化行为

摘要 将新型纳米材料引入偶氮苯 (AB) 及其衍生物中对分子异构化产生显着影响，因此具有广泛的应用前景。我们通过原位和实时表面增强拉曼散射 (SERS) 光谱系统地研究了直接锚定在 MoS2/GO 纳米复合材料上的对氨基偶氮苯 (pAAB) 的热和光致异构化。与裸 pAAB 相比，MoS2/GO 纳米复合材料使 pAAB 的热异构化效率提高了 3 倍以上。我们还表明，MoS2/GO 纳米复合材料对紫外线诱导的 pAAB 异构化几乎没有影响，但对蓝光照射下 pAAB 的逆顺反异构化有明显影响。结果表明，MoS2/GO 纳米复合材料对 pAAB 光致异构化的影响取决于照射波长，这可归因于由 pAAB 和 MoS2/GO 纳米复合材料组成的混合体系中电荷转移和结构弛豫的竞争相互作用。该研究有助于阐明偶氮苯分子的异构化在纳入纳米级组件时如何受到影响，从而为偶氮苯异构化在复杂混合纳米器件中的应用开辟了新的机会。