The crystal structure of d(C4) solved at 2.3-A resolution reveals a four-stranded molecule composed of two interdigitated or intercalated duplexes. The duplexes are held together by hemiprotonated cytosine-cytosine base pairs and are parallel stranded, but the two duplexes point in opposite directions. The molecule has a slow right-handed twist of 12.4 degrees between covalently linked cytosine base pairs, and the base stacking distance is 3.1 A. This is in general agreement with the NMR studies. A biological role for DNA in this conformation is suggested.
E-textiles
are gaining growing popularity recently due to low cost,
light weight, and conformable compatibility with clothes in wearable
and portable smart electronics. Here, an easy-handing, low cost, and
scalable fabricating strategy is reported to fabricate conductive,
highly flexible, and mechanically stretchable/twisted fiber gas sensor
with great wearability and knittability. The proposed gas sensor is
built using commercially available cotton/elastic threads as flexible/stretchable
templates and reduced graphene oxide/mesoporous zinc oxide nanosheets
as sensing layers to form conducting fibers. The as-prepared fiber
demonstrates sensitive sensing response, excellent long-term stability
(84 days), low theoretical detection limit (43.5 ppb NO2), great mechanical deformation tolerance (3000 bending cycles, 1000
twisting cycles and 65% strain strength), and washing durability in
room-temperature gas detection. More significantly, scalable wearable
characteristics including repairability, reliability, stability, and
practicability have been efficiently improved, which are achieved
by knotting the fractured fibers, incorporating multiple sensors in
series/parallel and weaving multisensor array networks integrated
into clothes. The good sensing properties, superior flexibility, and
scalable applications of wearable fibers may provide a broad window
for widespread monitoring of numerous human activities in personal
mobile electronics and human–machine interactions.
Flexible chemical sensors usually require transfer of prepared layers or whole device onto special flexible substrates and further attachment to target objects, limiting the practical applications. Herein, a sprayed gas sensor array utilizing silver nanoparticles (AgNPs)-all-carbon hybrid nanostructures is introduced to enable direct device preparation on various target objects. The fully flexible device is formed using metallic single-walled carbon nanotubes as conductive electrodes and AgNPs-decorated reduced graphene oxide as sensing layers. The sensor presents sensitive response ( R/ R) of 6.0-20 ppm NO, great mechanical robustness (3000 bending cycles), and obvious sensing ability as low as 0.2 ppm NO at room temperature. The sensitivity is about 3.3 and 13 times as that of the sample based on metal electrodes and the sample without AgNP decoration. The fabrication method demonstrates good scalability and suitability on the planar and nonplanar supports. The devices attached on a lab coat or the human body perform stable performance, indicating practicability in wearable and portable fields. The flexible and scalable sensor provides a new choice for real-time monitoring of toxic gases in personal mobile electronics and human-machine interactions.
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