In this letter, supercritical CO 2 (SCCO 2 ) fluids technology is employed for the first time to effectively passivate the defect states in hydrogenated amorphous-silicon thin-film transistors (a-Si:H TFTs) at low temperature (150 • C). With the high transport and diffusion properties of SCCO 2 fluids, it is proposed to act as a transporter in delivering the H 2 O molecules into the amorphous-silicon film and repairing defect states by the H 2 O molecules. In addition, the propyl alcohol is used as the surfactant between nonpolar-SCCO 2 fluids and polar-H 2 O molecules for mingling H 2 O molecules uniformly with the SCCO 2 fluids. After the treatment of SCCO 2 fluids mixed with water and propyl alcohol, the a-Si:H TFT exhibited superior transfer characteristics and lower threshold voltage. The improvement in electrical characteristics could be verified by the significant reduction of density of states in the mobility gap of amorphous-silicon. Index Terms-Amorphous-silicon thin-film transistors (a-Si:H TFTs), density of states (DOSs), supercritical CO 2 (SCCO 2 ) fluids technology.

Skeletal deformation motion is demonstrated from the specific vibronic excitation of phenol–quinoline molecules.

Thermogel is an injectable biomaterial that functions at body temperatures due to the ease of the sol-togel transition. However, most conventional physically crosslinked thermogels generally have relatively low stiffness, which limits various biomedical applications, particularly for stem-cellbased studies. While chemical cross-linking through doublenetwork (DN) structures can increase the stiffness of the hydrogel, they generally lack injectable and thermoresponsive properties due to strong covalent bonds between molecules. To address this challenge, we have developed a temperatureinduced nanostructure transition (TINT) system for preparing physical DN supramolecular hydrogels. These hydrogels possess injectable, thermoreversible characteristics and relatively high storage modulus (G′), which increases ∼14-fold from 20 to 37 °C (body temperature). Our bottom-up strategy is based on the co-assembly of aromatic peptide (Ben-FF) and poly(ethylene glycol) (PEG) to form a thermogel at 37 °C through a nanofiber dissociation pathway that differs from the well-known micelle aggregation or polymer shrinkage mechanisms. Peptide molecules form helical packing and weak, noncovalent interactions with PEG, resulting in co-assembled metastable nanofibers. Thermal perturbation initiates lateral dissociation of nanofibers into extensively cross-linked DN nanostructures and subsequent hydrogelation (ΔG = −13.32 kJ/mol). The TINT hydrogel is nontoxic to human mesenchymal stem cells and supports enhanced cell adhesion, suggesting the potential of this strategy in the applications of tissue engineering and regenerative medicine.

Matrix isolation spectroscopy with para-hydrogen (p-H 2 ) has previously been employed to record IR absorption spectra of hydrogenated and protonated polycyclic aromatic hydrocarbons (PAHs), prospective carriers of unidentified infrared and diffuse interstellar bands. Despite the promising prospects of p-H 2 as matrix host, especially the rather weak interaction with the guest molecules and the resulting small matrix shifts, p-H 2 matrix isolation spectroscopy has rarely been applied to study electronic transitions of guest molecules. Here, we present the dispersed fluorescence and fluorescence excitation spectrum of the 1-hydronaphthyl radical (1-C 10 H 9 ) isolated in solid p-H 2 . We observed a strong 0 0 0 band associated with the electronic transition to the first excited electronic state at 18881 cm −1 , red-shifted by ∼68 cm −1 relative to a value reported for jet-cooled 1-C 10 H 9 . From a comparison of our experimental results to simulated vibrationally resolved electronic absorption and emission spectra computed on the basis of (TD-)DFT geometry optimizations and scaled harmonic vibration calculations using the FCclasses code, we derived assignments for observed vibronic transitions. The dispersed fluorescence spectrum of 1-C 10 H 9 is new; it complements the infrared spectrum and identified many vibrational modes unidentifiable with infrared. The excitation spectrum covers a much wider spectral range than previous reports. We compare the excitation spectrum in solid p-H 2 to the reported electronic absorption spectrum of jet-cooled gaseous 1-C 10 H 9 and that of 1-C 10 H 9 isolated in solid Ne to assess the influence of p-H 2 as a matrix host on the electronic transition of 1-C 10 H 9 and discuss a potential contribution of 1-C 10 H 9 to the diffuse interstellar bands.