We report on the mechanism and efficiencies of singlet oxygen O₂(¹Δ_g) generation of nanoparticles (NP) of the conjugated polymer (CP) poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT) doped with platinum octaethylporphyrin (PtOEP) suspended in water. A detailed study of the photophysics of these NP, using stationary and time-resolved absorption and emission techniques, indicates that O₂(¹Δ_g) is generated by the triplet excited state of F8BT and not by that of PtOEP, as previously observed for other porphyrin doped CP NP. O₂(¹Δ_g) quantum yields (Φ_Δ) were measured by quantifying the characteristic phosphorescence of O₂(¹Δ_g) in the NIR region (∼1268 nm). It was found that incorporation of relatively small amounts of PtOEP to F8BT NP results in a significant increase of Φ_Δ. NP containing 10% PtOEP (w/w) show a Φ_Δ ∼ 0.24, which is 3 times larger than that observed for undoped F8BT NP, and larger than the reported for most water-soluble porphyrins. Φ_Δ were also calculated from the oxidation rates (v₀) of 3-[10-(2-carboxyethyl)anthracen-9-yl]propanoic acid (ADPA), a well-known chemical O₂(¹Δ_g) trap. Unexpectedly, this method was found to significantly overestimate the Φ_Δ values due to the adsorption of ADPA on the surface of NP. The ADPA/NP adsorption process was characterized using a simple adsorption model yielding an (average) equilibrium constant of ∼8 × 10³ M⁻¹ and an (average) number of NP-binding sites of ∼14000. These results necessarily caution about the use of ADPA as a probe to evaluate Φ_Δ in these NP systems. In addition, the interaction of F8BT NP with other anionic, cationic and zwitterionic dyes (dissolved in water) was studied. It was found that even at nano-molar concentrations all the dyes efficiently adsorb on the NP surface. This general and simple self-assembly strategy can be used to prepare superficially-dye-doped CP NP with potentially interesting technological applications.

我们的机制和单线态氧的效率ø报告₂（¹ Δ_克）产生的共轭聚合物（CP）的聚的纳米颗粒（NP）（9,9- dioctylfluorene-的中高音掺杂有铂八乙基卟啉-benzothiadiazole）（F8BT）（ PtOEP）悬浮在水中。这些NP的光物理的详细研究中，使用固定的和时间分辨的吸收和发射技术，表示其中O ₂（¹ Δ_克）由F8BT的三重激发态，而不是由该的PtOEP的产生，如先前所观察到其他卟啉掺杂的CP NP。Ô ₂（¹ Δ_克）量子产率（Φ _Δ）通过定量的O-特性磷光测定₂（¹ Δ_克在NIR区域（~1268纳米））。结果发现相对少量的的PtOEP，以F8BT NP结果掺入Φ的显著增加_Δ。NP含有10％的PtOEP（w / w的）示出了Φ _Δ  〜0.24，这比未掺杂F8BT NP观察到比报道的大多数水溶性卟啉的3倍，而较大。Φ _Δ还从氧化速率计算（v ₀）的3- [10-（2-羧乙基）蒽-9-基]丙酸（ADPA），公知的化学Ö ₂（¹ Δ_克） 陷阱。出乎意料的是，已发现这种方法来显著高估Φ _Δ值由于ADPA的NP的表面上的吸附。ADPA / NP吸附过程的特征在于使用简单的吸附模型，该模型产生的（平均）平衡常数约为8×10 ³  M ^-1，NP结合位点的平均数目约为14000。这些结果一定提醒关于使用ADPA的作为探针来评估Φ _Δ在这些NP系统中。此外，还研究了F8BT NP与其他阴离子，阳离子和两性离子染料（溶于水）的相互作用。发现即使在纳摩尔浓度下，所有染料也有效吸附在NP表面上。这种一般和简单的自组装策略可用于制备具有潜在有趣技术应用的表面染料掺杂CP NP。