Ordered assemblies of Fe3O4 and a donor-acceptor-type π-conjugated polymer in nanoparticles for enhanced photoacoustic and magnetic effects

Conjugated Polymer Nanoparticles: Photothermal and Photodynamic Capabilities According to Molecular Ordering in Their Assembly Structures

“…On the other hand, the induced absorption band peaking at ∼1260 nm at t delay > 70 ps that persisted beyond our instrumental time-delay limit (3.8 ns) has been ascribed to the spectral signatures of either polaron or the triplet exciton, corresponding to 3 Ex 1 → 3 Ex n transition in PCPDTBT (Figure S8). − Previously, it was shown that in PCPDTBT, the induced absorption spectroscopic signature for the triplet exciton (λ max (T 1 → T n ) = ∼1260 nm) is almost identical to that for the polaron. , In addition, sub-nanosecond triplet-exciton formation has been observed in PCPDTBT thin films via a nongeminate charge-recombination process, instead of slow intersystem crossing from the 1 CT to 3 CT state . Given the determined singlet excitons’ lifetime of ∼10 ps for all CPNs, it is unlikely that S 1 → T 1 or 1 CT → 3 CT intersystem crossing processes effectively occur.…”

Selective CO2 adsorption and bathochromic shift in a phosphocholine-based lipid and conjugated polymer assembly

“…Phospholipids, on the other hand, can form a bilayer structure with high polar boundaries and hydrophobic intermediate layer, as seen in cell membranes, by compact packing of polar heads and alkyl tails. [32][33][34][35][36] As we previously demonstrated, conjugated polymers can be integrated into the intermediate layer by alkyl chain association between the polymers' side chains and the phospholipids' tails, resulting in nanoparticles with a hydrophobic polymer core and an outer surface made up of polar lipid heads, [37][38][39] which can be employed for photocatalysis. 40,41 Such integration of organic and polymeric semiconductors in the intermediate layer of the lipid bilayer and increased charge transfer efficiency 42 were also demonstrated for microbial fuel cells, 43 membrane sensors [44][45][46] and photocurrent generation systems.…”

Strong Bathochromic Shift of Conjugated Polymer Nanowires Assembled with a Liquid Crystalline Alkyl Benzoic Acid via a Film Dispersion Process

“… 10 − 12 In addition, they can efficiently harvest energy from a wide range of light, from ultraviolet (UV) to near-infrared (NIR) regions, by conveniently adjusting their band gaps, and either emit the energy as light or heat or transport it to other materials. Accordingly, they have been considered an ideal material for photoluminescence imaging 13 − 15 and sensing, 16 − 18 photoacoustic imaging 19 − 21 and photothermal therapy upon heat generation, 22 − 24 and photocatalysis reactions by efficient light harvesting. 3 , 25 , 26 The preparation of nanowires has been important for enhancing the performance in these applications.…”

“…Through intra- and intermolecular charge transfer in assemblies of conjugated polymers, charge carriers can efficiently transport to enhance the efficiency of field-effect transistors (FETs), − light-emitting diodes (LEDs), − and photovoltaic cells. − In addition, they can efficiently harvest energy from a wide range of light, from ultraviolet (UV) to near-infrared (NIR) regions, by conveniently adjusting their band gaps, and either emit the energy as light or heat or transport it to other materials. Accordingly, they have been considered an ideal material for photoluminescence imaging − and sensing, − photoacoustic imaging − and photothermal therapy upon heat generation, − and photocatalysis reactions by efficient light harvesting. ,, The preparation of nanowires has been important for enhancing the performance in these applications. For example, charge transport efficiency in FETs can be significantly improved when conjugated backbones are assembled in one-dimensional (1D) nanowires, nanorods, or nanofibers due to the increased intermolecular charge transport. − In addition, intermolecular electron delocalization can narrow the band gaps of conjugated polymers, thereby enlarging the range of light absorption in the visible and NIR regions, thus enhancing light harvesting efficiency, which is useful when conjugated polymers are used as a photosensitizer in photocatalysis applications. − …”