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Counting fluorescent dye molecules on DNA origami by means of photon statistics.
Obtaining quantitative information about molecular assemblies with high spatial and temporal resolution is a challenging task in fluorescence microscopy. Single-molecule techniques build on the ability to count molecules one by one. Here, a method is presented that extends recent approaches to analy...
Transient, biocompatible electronics and energy harvesters based on ZnO.
The combined use of ZnO, Mg, MgO, and silk provides routes to classes of thin-film transistors and mechanical energy harvesters that are soluble in water and biofluids. Experimental and theoretical studies of the operational aspects and dissolution properties of this type of transient electronics te...
Twisted bi-layer graphene: microscopic rainbows.
Blue, pink, and yellow colorations appear from twisted bi-layer graphene (tBLG) when transferred to a SiO2 /Si substrate (SiO2 = 100 nm-thick). Raman and electron microscope studies reveal that these colorations appear for twist angles in the 9-15° range. Optical contrast simulations confirm that th...
Cross-Linked g-C3 N4 /rGO Nanocomposites with Tunable Band Structure and Enhanced Visible Light Photocatalytic Activity.
Cross-linked rather than non-covalently bonded graphitic carbon nitride (g-C3 N4 )/reduced graphene oxide (rGO) nanocomposites with tunable band structures have been successfully fabricated by thermal treatment of a mixture of cyanamide and graphene oxide with different weight ratios. The experiment...
Hydrothermal growth of TiO2 nanorod arrays and in situ conversion to nanotube arrays for highly efficient quantum dot-sensitized solar cells...
TiO2 nanorod (NR) and nanotube (NT) arrays grown on transparent conductive substrates are attractive electrode for solar cells. In this paper, TiO2 NR arrays are hydrothermally grown on FTO substrate, and are in situ converted into NT arrays by hydrothermally etching. The TiO2 NR arrays are reported...
Synergetic material and structure optimization yields robust spider web anchorages.
Millions of years of evolution have adapted spider webs to achieve a range of properties, including the well-known capture of prey, with efficient use of materials. One feature that remains poorly understood is the attachment disc, a network of silk fibers that mechanically anchors a web to its envi...
Hierarchically nanoperforated graphene as a high performance electrode material for ultracapacitors.
High performance is reported for a symmetric ultracapacitor (UC) cell made up of hierarchically perforated graphene nanosheets (HPGN) as an electrode material with excellent values of energy density (68.43 Wh kg(-1) ) and power density (36.31 kW kg(-1) ). Perforations are incorporated in the graphit...
Thermal and Electrical Conduction in Ultrathin Metallic Films: 7 nm down to Sub-Nanometer Thickness.
For ultrathin metallic films (e.g., less than 5 nm), no knowledge is yet available on how electron scattering at surface and grain boundaries reduces the electrical and thermal transport. The thermal and electrical conduction of metallic films is characterized down to 0.6 nm average thickness. The e...
A novel graphene oxide-based surface plasmon resonance biosensor for immunoassay.
Graphene oxide (GO) is used as a support for binding with proteins. A GO-based wavelength modulation surface plasmon resonance biosensor shows high sensitivity and selectivity for detection of human immunoglobulin G (IgG). When IgG is coupled with gold nanorods (AuNRs), the size increase results in...
Conductive black silicon surface made by silver nanonetwork assisted etching.
Conductive black silicon surfaces (CBSSs) are fabricated by Ag network-assisted catalytic etching, with the Ag network buried in silicon for low reflectance. The CBSSs present a high light absorbance of 97% and good electrical conductivity of less than 10 Ω/□. The CBSSs might be used as anti-reflect...