Electronic skin sensing devices are an emerging technology and have substantial demand in vast practical fields including wearable sensing, robotics, and user‐interactive interfaces. In order to imitate or even outperform the capabilities of natural skin, the keen exploration of materials, device structures, and new functions is desired. However, the very high resistance and the inadequate current switching and sensitivity of reported electronic skins hinder to further develop and explore the promising uses of the emerging sensing devices. Here, a novel resistive cloth‐based skin‐like sensor device is reported that possesses unprecedented features including ultrahigh current‐switching behavior of ≈107 and giant high sensitivity of 1.04 × 104–6.57 × 106 kPa−1 in a low‐pressure region of <3 kPa. Notably, both superior features can be achieved by a very low working voltage of 0.1 V. Taking these remarkable traits, the device not only exhibits excellent sensing abilities to various mechanical forces, meeting various applications required for skin‐like sensors, but also demonstrates a unique competence to facile integration with other functional devices for various purposes with ultrasensitive capabilities. Therefore, the new methodologies presented here enable to greatly enlarge and advance the development of versatile electronic skin applications.
Two novel bacteria, with an optimum growth temperature of approximately 60 6C, were isolated from Lu-shan hot springs in the central region of Taiwan. These isolates were aerobic, thermophilic, halotolerant, pink-pigmented, heterotrophic and resistant to gamma-radiation. Both pleomorphic, short, rod-shaped cells and coccoid cells were observed. Strains LS-286 (=ATCC BAA-452=BCRC 17198) and LS-293 T (=ATCC BAA-406 T =BCRC 17173 T ) represented a novel species of the genus Rubrobacter, according to a phylogenetic analysis of the 16S rRNA gene, DNA-DNA hybridization, biochemical features and fatty acid composition. The name Rubrobacter taiwanensis sp. nov. is proposed for this novel species, with LS-293 T as the type strain.
Inorganic−organic hybrid perovskite single crystals are potential materials for the application of high performance optoelectronic devices. The exposed surface of single crystals can dramatically affect the measured properties. Facet-dependent behaviors are also speculated. However, impeded by the lack of facile facet engineering strategy for inorganic−organic hybrid perovskites, the relationship between different facets and respective performance remains elusive. In this work, we present a simple approach of ligandmediated crystal growth to control the shape and the exposed facets of methylammonium lead iodide single crystals. The addition of oleylamine ligand can trigger the continuous morphological transition from dodecahedral-shaped single crystal enclosed by (100) T and ( 112) T to cubic-shaped single crystal enclosed by (110) T and (002) T while maintaining the material composition and crystalline phase. We fabricated single crystal based photodetectors and carried out the first unambiguous study on the relationship between facet structure and device performance. This report opens a new paradigm to reveal the facetdependent properties and to enhance the device performance of single crystal.
Metal–organic
frameworks (MOF) are studied extensively in
applications like catalysts, gas storage, and sensors due to their
various functional groups and structures. Two-dimensional (2D) MOFs
such as triphenylene-based materials show excellent charge transport
properties, but thin-film fabrication and organic ligand synthesis
are difficult. In this work, we synthesize thiol-based organic ligand,
benzenehexathiol (BHT), by a simple one-pot reaction. This facile
method is safer and faster than conventional synthesis procedure that
requires using liquid ammonia as solvent. Two novel 2D MOF materials,
Ag3BHT2 and Au3BHT2, are
fabricated by coordinating BHT with either silver (Ag) or gold (Au)
ions through liquid–liquid interfacial reaction. The Ag3BHT2 thin film reaches a high electrical conductivity
of 363 S cm–1, which has potential applications
in electronic devices and sensors.
Monitoring the ammonia gas is of great interest to both environmental benefits and human health. The recent advance in polymer thin film transistors (TFTs) can realize high sensitivity and low-cost gas sensors. Ammonia gas interacts with charge carrier channels and polymer/dielectrics interface through Coulomb force. This is the first report of high sensitivity and reusable ammonia sensor fabricated from thiophene-isoindigo donoracceptor conducting polymer. This kind of polymer has advantages of simple synthesis and excellent air stability. The systematic study is carried out to investigate relationship among chemical structure variation and morphology control of polymer to the performance of ammonia sensor. High crystallinity, favored crystal orientation, and direct percolation routes for analytes are found to be essential to increase the susceptibility of polymers to ammonia gas. By strengthening edge-on morphology, the sensitivity can be enhanced fivefold for the same polymer. The idea can put forward the development of sensor array in a time-efficient manner by employing the morphology effect.
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