A silver molecular ink platform formulated for screen, inkjet, and aerosol jet printing is presented. A simple formulation comprising silver neodecanoate, ethyl cellulose, and solvent provides improved performance versus that of established inks, yet with improved economics. Thin, screen-printed traces with exceptional electrical (<10 mΩ/□/mil or 12 μΩ·cm) and mechanical properties are achieved following thermal or photonic sintering, the latter having never been demonstrated for silver-salt-based inks. Low surface roughness, submicron thicknesses, and line widths as narrow as 41 μm outperform commercial ink benchmarks based on flakes or nanoparticles. These traces are mechanically robust to flexing and creasing (less than 10% change in resistance) and bind strongly to epoxy-based adhesives. Thin traces are remarkably conformal, enabling fully printed metal-insulator-metal band-pass filters. The versatility of the molecular ink platform enables an aerosol jet-compatible ink that yields conductive features on glass with 2× bulk resistivity and strong adhesion to various plastic substrates. An inkjet formulation is also used to print top source/drain contacts and demonstrate printed high-mobility thin film transistors (TFTs) based on semiconducting single-walled carbon nanotubes. TFTs with mobility values of ∼25 cm V s and current on/off ratios >10 were obtained, performance similar to that of evaporated metal contacts in analogous devices.

Dual-crosslinked alginate hydrogels with a high Ca2+ content were successfully prepared, which extended their properties, and showed potential application as a skin strain sensor.

In the past few years, anatase/rutile TiO 2 heterophase junction structures with highly efficient photocatalytic performance have been explored widely, while their activities are still unsatisfactory in solar-to-hydrogen energy conversion. In this study, a novel anatase/rutile TiO 2 photoelectrode with hydrogenated heterophase interface structures (A-H-RTNA) was successfully designed and synthesized for the first time via hydrothermal synthesis− hydrogenation−branching growth. Structure characterization indicated that the hydrogenated interfaces between anatase− branches and rutile−TiO 2 −nanorod hold appropriate oxygen vacancies and Ti 3+ and inferred that new energy levels of oxygen vacancy and Ti−OH lie below the band edge positions of conduction band and valence band of rutile TiO 2 nanorod, respectively. The matching energy levels between anatase−branches and hydrogenated rutile−nanorod obviously reduce the recombination of the photogenerated carriers, resulting in a superior photoelectrochemical (PEC) performance. The hydrogen evolution rate on A-H-RTNA photoelectrode for PEC water splitting is 20 and 2.1 times those of unhydrogenated TiO 2 nanorod arrays photoelectrode (RTNA) and surface-hydrogenated anatase/rutile TiO 2 photoelectrode (H-A-RTNA), respectively. This work provides new insight into the effect of hydrogenated heterophase interface structure on the PEC properties of TiO 2 .

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A study of charge-carrier recombination in intrinsic hydrogenated amorphous silicon ͑a-Si:H͒ is presented using pulsed electrically and pulsed optically detected magnetic-resonance spectroscopies in order to measure the influence of spin-dependent recombination on photoluminescence ͑PL͒ and photoconductivity ͑PC͒. The experiments show band tail state recombination influencing the PL but not the PC which constitutes geminate recombination of correlated charge carriers that do not contribute to charge transport. In contrast, nongeminate recombination through silicon dangling bonds is observed influencing both PL and PC. The experiments presented constitute a direct and unambiguous observation of geminate and nongeminate recombination in a-Si:H.