A smart multifunctional biointerface with dimensional compatibility and good electrical conductivity is constructed by growing human breast adenocarcinoma cells on layered graphene–artificial peroxidase–extracellular matrix protein and further used to in situ selectively and quantatively detect reactive oxygen species, for the first time discovering that the number of extracellular released hydrogen peroxide molecules is around 1011 per cell.

Layering in the sun: Layered graphene and quantum dot (QD) films can be fabricated simply on transparent conducting indium tin oxide (ITO) substrates from aqueous solutions. The structure and favorable work function of graphene make it effective for the collection and transfer of photogenerated charges to the electrode, resulting in a high‐performance photovoltaic device (see picture; IPCE=incident photon‐to‐charge‐carrier conversion efficiency, SWNT=single‐walled carbon nanotube).

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A series of solution-processable oleic-acid capped barium titanate and strontium titanate nanoparticles was synthesized and spin-coated to form homogeneous high-k dielectric films for organic thin-film transistors (TFTs). The dielectric constant k of the nanoparticle films was tunable in the range from 4.1 to 9.3 by altering the molar ratio of oleic-acid surfactant to synthesis precursor. Low-voltage modulated high-performance organic TFTs were fabricated using nanoparticle films as the dielectric components. Flexible bottom-gate pentacene TFTs exhibited outstanding device performance with field-effect mobility, μ, in the range of 2.0−3.5 cm2 V−1 s−1 and on/off ratios of about 1 × 104 at low gate voltage. Top-gate poly(3,3′′′-didodecylquaterthiophene) TFTs also showed high device performance with μ of 0.05−0.1 cm2 V−1 s−1 and on/off ratios of 1 × 103 to 1 × 104. The low-voltage performance of the TFTs could be attributed to a low density of trapped states at the interfaces between the organic semiconductors and the nanoparticle dielectric films. This research provides a series of promising dielectric materials for fabrication of superior organic TFTs through a solution process and fundamentally suggests that low trapped state density at the semiconductor/dielectrics interface may be an important factor to achieve low-voltage modulation in organic TFTs.