This report plies the effect of temperature on the interaction of GO and polyaniline at different pH through photoluminescence (PL) studies. At neutral pH, the interaction of GO-PANI is found to be highly temperature-dependent. A ground state charge transfer (CT) from the polaronic state of PANI to the GO remained at the backbone of the photophysics. The electron transfer from PANI to GO becomes more significant at a higher temperature because of the better interaction of GO with PANI moiety through π−π stacking and hydrogen bonding. The CT-induced PL amplification at elevated temperature is originating from the recombination of the spatially separated electron in the excited state of GO and hole in the PANI. The thermodynamic parameters and have been calculated associated with the electron transfer process. The positive change in the electronic entropy due to the better delocalization overcomes the entropy change due to structural orderness that drives the electron transfer process. The intensity of different PL bands remains unaffected by the temperature at lower pH due to saturated electron transfer and lower GO-PANI interaction, whereas at higher pH the CT PL band intensity decreases with an increment in temperature, explained by the increase in GO-PANI distance.

中文翻译：

---

通过相互作用调制电荷转移实现氧化石墨烯-聚苯胺复合材料的温度诱导光致发光放大

本报告通过光致发光（PL）研究，探讨了温度对不同 pH 值下 GO 和聚苯胺相互作用的影响。在中性 pH 条件下，GO-PANI 的相互作用高度依赖于温度。从 PANI 的极化状态到 GO 的基态电荷转移 (CT) 仍然是光物理学的支柱。由于 GO 与 PANI 部分通过 π−π 堆积和氢键有更好的相互作用，因此从 PANI 到 GO 的电子转移在较高温度下变得更加显着。 CT在高温下引起的PL放大源于GO激发态中空间分离的电子与PANI中空穴的重组。已计算出与电子转移过程相关的热力学参数。由于更好的离域而导致的电子熵的正变化克服了由于驱动电子转移过程的结构有序性而导致的熵变化。由于饱和电子转移和较低的 GO-PANI 相互作用，不同 PL 带的强度在较低 pH 下不受温度影响，而在较高 pH 下，CT PL 带强度随着温度的升高而降低，这可以通过 GO-PANI 的增加来解释距离。