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https://www.readbyqxmd.com/read/28643788/terahertz-saturable-absorbers-from-liquid-phase-exfoliation-of-graphite
#1
Vezio Bianchi, Tian Carey, Leonardo Viti, Lianhe Li, Edmund H Linfield, A Giles Davies, Alessandro Tredicucci, Duhee Yoon, Panagiotis G Karagiannidis, Lucia Lombardi, Flavia Tomarchio, Andrea C Ferrari, Felice Torrisi, Miriam S Vitiello
Saturable absorbers (SA) operating at terahertz (THz) frequencies can open new frontiers in the development of passively mode-locked THz micro-sources. Here we report the fabrication of THz SAs by transfer coating and inkjet printing single and few-layer graphene films prepared by liquid phase exfoliation of graphite. Open-aperture z-scan measurements with a 3.5 THz quantum cascade laser show a transparency modulation ∼80%, almost one order of magnitude larger than that reported to date at THz frequencies...
June 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28640182/paper-as-active-layer-in-inkjet-printed-capacitive-humidity-sensors
#2
Cristina Gaspar, Juuso Olkkonen, Soile Passoja, Maria Smolander
An inkjet-printed relative humidity sensor based on capacitive changes which responds to different humidity levels in the environment is presented in this work. The inkjet-printed silver interdigitated electrodes configuration on the paper substrate allowed for the fabrication of a functional proof-of-concept of the relative humidity sensor, by using the paper itself as a sensing material. The sensor sensitivity in terms of relative humidity changes was calculated to be around 2 pF/RH %. The response time against different temperature steps from 3 to 85 °C was fairly constant (about 4-5 min), and it was considered fast for the aimed application, a smart label...
June 22, 2017: Sensors
https://www.readbyqxmd.com/read/28621773/an-all-inkjet-printed-flexible-uv-photodetector
#3
Yuhui Dong, Yousheng Zou, Jizhong Song, Jianhai Li, Boning Han, Qingsong Shan, Leimeng Xu, Jie Xue, Haibo Zeng
In this work, a novel concept of the all-inkjet-printed flexible photodetectors based on ZnO nanocrystals with high performance was proposed and demonstrated with emphasis on the influence of different post-treatments including UV light irradiation and high temperature annealing. The photodetectors based on UV-treated ZnO nanocrystal films exhibit a responsivity and an on/off ratio as high as 0.14 A W(-1) and >10(3), respectively, which are better than the thermally treated devices. The high performance of ZnO nanocrystal-based photodetectors originates from unique band-edge modulation among the nanoparticles, where the existence of Schottky barriers leads to a low dark current and gives rise to a fast photoelectric response...
June 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/28598163/structural-color-patterns-on-paper-fabricated-by-inkjet-printer-and-their-application-in-anti-counterfeiting
#4
Suli Wu, Baoqi Liu, Xin Su, Shufen Zhang
Inkjet printed structural color patterns have attracted great attention in recent years because of their broadly promising applications. However, the patterns are usually fabricated on pre-treated plastic substrates. Herein a convenient inkjet printing method was developed to fabricate large scale computer designed structural color patterns on photo paper without any treatment using inks containing monodisperse CdS spheres. By this strategy, not only the single color and multi-color structural color patterns on paper were successfully obtained, but also invisible photonic anti-counterfeiting was achieved without any external stimuli...
June 9, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28586316/direct-3d-cell-printing-of-human-skin-with-functional-transwell-system
#5
Byoung Soo Kim, Jung-Seob Lee, Ge Gao, Dong-Woo Cho
Three-dimensional (3D) cell-printing has been emerging as a promising technology with which to build up human skin models by enabling rapid and versatile design. Despite the technological advances, challenges remain in the development of fully functional models that recapitulate complexities in the native tissue. Moreover, although several approaches have been explored for the development of biomimetic human skin models, the present skin models based on multistep fabrication methods using polydimethylsiloxane chips and commercial transwell inserts could be tackled by leveraging 3D cell-printing technology...
June 6, 2017: Biofabrication
https://www.readbyqxmd.com/read/28585688/preliminary-study-on-determining-the-sequence-of-intersecting-lines-by-fluorescence-technique
#6
Biao Li, Guo Liang Ouyang, Peng Nan Zhao
The determination of the sequence of intersecting lines is an important part of questioned document examinations. A fluorescence technique was used to determine the sequence of heterogeneous intersecting lines produced using inkpad ink, stamp-pad ink, ballpoint pens, gel pens, fountain pens, colorants of carbon paper, photocopiers, laser printers, and inkjet printers. A SteREO Discovery.V20 equipped with the ZEN Blue Lite software was chosen to perform the tests.As the results obtained from the study were positive under most conditions, the fluorescence technique was found to be very successful in determining the sequence of intersecting lines from ballpoint pen, gel pen, fountain pen, photocopier, laser and inkjet printers, and inkpad inks...
June 6, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28580906/modelling-the-evaporation-of-nanoparticle-suspensions-from-heterogeneous-surfaces
#7
Christopher Chalmers, Roger Smith, Andrew J Archer
We present a kinetic Monte Carlo (KMC) grid-based model for the drying of drops of a nanoparticle suspension upon a heterogeneous surface. The model consists of a generalised lattice-gas in which the interaction parameters in the Hamiltonian can be varied to model different properties of the materials involved. We show how to choose correctly the interactions, to minimise the effects of the underlying grid so that hemispherical droplets form. We also include the effects of surface roughness to examine the effects of contact-line pinning on the dynamics...
June 5, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28579922/solution-of-an-elusive-pigment-crystal-structure-from-a-thin-film-a-combined-x-ray-diffraction-and-computational-study
#8
Andrew O F Jones, Christian Röthel, Roman Lassnig, O N Bedoya-Martínez, Paul Christian, Ingo Salzmann, Birgit Kunert, Adolf Winkler, Roland Resel
Epindolidione, a hydrogen-bonded derivative of the organic semiconductor tetracene, is an organic pigment which has previously been used to produce stable OFETs with relatively high hole mobilities. Despite its use as an inkjet pigment and organic semiconductor, the crystal structure of epindolidione has proved elusive and is currently unknown. In this work, we report a crystal structure solution of epindolidione determined from vapor deposited thin films using a combined experimental and theoretical approach...
April 14, 2017: CrystEngComm
https://www.readbyqxmd.com/read/28558136/multiphoton-direct-laser-writing-and-3d-imaging-of-polymeric-freestanding-architectures-for-cell-colonization
#9
Angelo Accardo, Marie-Charline Blatché, Rémi Courson, Isabelle Loubinoux, Christophe Thibault, Laurent Malaquin, Christophe Vieu
The realization of 3D architectures for the study of cell growth, proliferation, and differentiation is a task of fundamental importance for both technological and biological communities involved in the development of biomimetic cell culture environments. Here we report the fabrication of 3D freestanding scaffolds, realized by multiphoton direct laser writing and seeded with neuroblastoma cells, and their multitechnique characterization using advanced 3D fluorescence imaging approaches. The high accuracy of the fabrication process (≈200 nm) allows a much finer control of the micro- and nanoscale features compared to other 3D printing technologies based on fused deposition modeling, inkjet printing, selective laser sintering, or polyjet technology...
May 30, 2017: Small
https://www.readbyqxmd.com/read/28546896/study-of-the-correlation-between-sensing-performance-and-surface-morphology-of-inkjet-printed-aqueous-graphene-based-chemiresistors-for-no2-detection
#10
F Villani, C Schiattarella, T Polichetti, R Di Capua, F Loffredo, B Alfano, M L Miglietta, E Massera, L Verdoliva, G Di Francia
The extremely high sensitivity to the external environment and the high specific surface area, as well as the absence of bulk phenomena that could interfere with the response signal, make graphene highly attractive for the applications in the field of sensing. Among the various methods for producing graphene over large areas, liquid phase exfoliation (LPE) appears to be very promising, especially if combined with inkjet printing (IJP), which offers several advantages, including the selective and controlled deposition of small ink volumes and the versatility of the exploitable inks and substrates...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28542948/the-capability-of-raman-microspectroscopy-to-differentiate-printing-inks
#11
Chelsea E Johnson, Paul Martin, Katherine A Roberts, Tatiana Trejos, Ruthmara Corzo, Jose R Almirall, Alan M Safer
This study applies Raman microspectroscopy to differentiate the chemical components in printing inks of different brands, colors, and type using the 532 nm and 785 nm excitation wavelengths. Spectra were collected from 319 inks (78 inkjet, 76 toner, 79 offset, and 86 intaglio) representing various colors. Comparisons were performed to calculate discrimination capability percentages for each ink type. Overall, Raman microspectroscopy differentiates according to the following hierarchy: intaglio (96%), inkjet (92%), offset (90%), and toner (61%)...
May 24, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28541035/three-dimensional-printing-of-silver-microarchitectures-using-newtonian-nanoparticle-inks
#12
Sanghyeon Lee, Jung Hyun Kim, Muhammad Wajahat, Hwakyung Jeong, Won Suk Chang, Sung Ho Cho, Ji Tae Kim, Seung Kwon Seol
Although three-dimensional (3D) printing has recently emerged as a technology to potentially bring about the next industrial revolution, the limited selection of usable materials restricts its use to simple prototyping. In particular, metallic 3D printing with submicrometer spatial resolution is essential for the realization of 3D-printed electronics. Herein, a meniscus-guided 3D printing method that exploits a low-viscosity (∼7 mPa·s) silver nanoparticle (AgNP) ink meniscus with Newtonian fluid characteristics (which is compatible with conventional inkjet printers) to fabricate 3D silver microarchitectures is reported...
June 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28540370/ultralow-friction-of-ink-jet-printed-graphene-flakes
#13
R Buzio, A Gerbi, S Uttiya, C Bernini, A E Del Rio Castillo, F Palazon, A S Siri, V Pellegrini, L Pellegrino, F Bonaccorso
We report the frictional response of few-layer graphene (FLG) flakes obtained by the liquid phase exfoliation (LPE) of pristine graphite. To this end, we inkjet print FLG on bare and hexamethyldisilazane-terminated SiO2 substrates, producing micrometric patterns with nanoscopic roughness that are investigated by atomic force microscopy. Normal force spectroscopy and atomically-resolved morphologies indicate reduced surface contamination by solvents after a vacuum annealing process. Notably, the printed FLG flakes show ultralow friction comparable to that of micromechanically exfoliated graphene flakes...
June 8, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534907/inkjet-printed-highly-transparent-and-flexible-graphene-micro-supercapacitors
#14
Szymon Sollami Delekta, Anderson D Smith, Jiantong Li, Mikael Östling
Modern energy storage devices for portable and wearable technologies must fulfill a number of requirements, such as small size, flexibility, thinness, reliability, transparency, manufacturing simplicity and performance, in order to be competitive in an ever expanding market. To this end, a comprehensive inkjet printing process is developed for the scalable and low-cost fabrication of transparent and flexible micro-supercapacitors. These solid-state devices, with printed thin films of graphene flakes as interdigitated electrodes, exhibit excellent performance versus transparency (ranging from a single-electrode areal capacitance of 16 μF cm(-2) at transmittance of 90% to a capacitance of 99 μF cm(-2) at transmittance of 71%)...
June 1, 2017: Nanoscale
https://www.readbyqxmd.com/read/28518077/inkjet-printed-polyvinyl-alcohol-multilayers
#15
Iulia Salaoru, Zuoxin Zhou, Peter Morris, Gregory J Gibbons
Inkjet printing is a modern method for polymer processing, and in this work, we demonstrate that this technology is capable of producing polyvinyl alcohol (PVOH) multilayer structures. A polyvinyl alcohol aqueous solution was formulated. The intrinsic properties of the ink, such as surface tension, viscosity, pH, and time stability, were investigated. The PVOH-based ink was a neutral solution (pH 6.7) with a surface tension of 39.3 mN/m and a viscosity of 7.5 cP. The ink displayed pseudoplastic (non-Newtonian shear thinning) behavior at low shear rates, and overall, it demonstrated good time stability...
May 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28505423/simple-inkjet-process-to-fabricate-microstructures-of-chitinous-nanocrystals-for-cell-patterning
#16
Shuntaro Suzuki, Yoshikuni Teramoto
Structural polysaccharide nanocrystals (NCs) including cellulose nanocrystal have attracted attention. In order to broaden the range of application of the NCs, we can take advantage of their original characteristics by establishing simple and reasonable processing methods. We here demonstrate a micropatterning of animal cellular adhesion by inkjet printing of aqueous dispersions of cytocompatible chitinous NCs onto cellophane films. We display how to regulate the deposition form and two-dimensional shape of the chitinous NC micromoldings using a research inkjet printer...
May 22, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28503662/picoliter-volume-inkjet-printing-into-planar-microdevice-reservoirs-for-low-waste-high-capacity-drug-loading
#17
Cade B Fox, Cameron L Nemeth, Rachel W Chevalier, Joshua Cantlon, Derek B Bogdanoff, Jeff C Hsiao, Tejal A Desai
Oral delivery of therapeutics is the preferred route for systemic drug administration due to ease of access and improved patient compliance. However, many therapeutics suffer from low oral bioavailability due to low pH and enzymatic conditions, poor cellular permeability, and low residence time. Microfabrication techniques have been used to create planar, asymmetric microdevices for oral drug delivery to address these limitations. The geometry of these microdevices facilitates prolonged drug exposure with unidirectional release of drug toward gastrointestinal epithelium...
March 2017: Bioengineering & Translational Medicine
https://www.readbyqxmd.com/read/28496134/inkjet-printing-of-nio-films-and-integration-as-hole-transporting-layers-in-polymer-solar-cells
#18
Arjun Singh, Shailendra Kumar Gupta, Ashish Garg
Stability concerns of organic solar cell devices have led to the development of alternative hole transporting layers such as NiO which lead to superior device life times over conventional Poly(3,4-ethylenedioxythiophene) Polystyrene sulfonate (PEDOT:PSS) buffered solar cells. From the printability of such devices, it is imperative to be able to print NiO layers in the organic solar cell devices with normal architecture which has so far remained unreported. In this manuscript, we report on the successful ink-jet printing of very thin NiO thin films with controlled thickness and morphology and their integration in organic solar cell devices...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28481267/inkjet-printed-membrane-for-a-capacitive-acoustic-sensor-development-and-characterization-using-laser-vibrometer
#19
Rubaiyet Iftekharul Haque, Erick Ogam, Patrick Benaben, Xavier Boddaert
This paper describes the fabrication process and the method to determine the membrane tension and defects of an inkjet-printed circular diaphragm. The membrane tension is an important parameter to design and fabricate an acoustic sensor and resonator with the highest sensitivity and selectivity over a determined range of frequency. During this work, the diaphragms are fabricated by inkjet printing of conductive silver ink on pre-strained Mylar thin films, and the membrane tension is determined using the resonant frequency obtained from its measured surface velocity response to an acoustic excitation...
May 6, 2017: Sensors
https://www.readbyqxmd.com/read/28471650/food-quality-monitor-paper-based-plasmonic-sensors-prepared-through-reversal-nanoimprinting-for-rapid-detection-of-biogenic-amine-odorants
#20
Shih-Yu Tseng, Szu-Ying Li, Shang-Yi Yi, Aileen Y Sun, Dong-Yu Gao, Dehui Wan
This paper describes the fabrication of paper-based plasmonic refractometric sensors through the embedding of metal nanoparticles (NPs) onto flexible papers using reversal nanoimprint lithography. The NP-embedded papers can serve as gas sensors for the detection of volatile biogenic amines (BAs) released from spoiled food. Commercial inkjet papers were employed as sensor substrates-their high reflectance (>80%) and smooth surfaces (roughness: ca. 4.9 nm) providing significant optical signals for reflection-mode plasmonic refractometric sensing and high particle transfer efficiency, respectively; in addition, because inkjet papers have lightweight and are burnable and flexible, they are especially suitable for developing portable, disposable, cost-effective, eco-friendly sensing platforms...
May 11, 2017: ACS Applied Materials & Interfaces
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