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Tomohito Sekine, Jun Sato, Yasunori Takeda, Daisuke Kumaki, Shizuo Tokito
We evaluated electrochemical behaviors and reliability of printed Silver (Ag) electrodes prepared from nanoparticle inks with the use of protective self-assembled monolayers (SAMs) under electronic bias conditions. The printed Ag electrodes were fabricated by inkjet printing on a hydrophobic substrate. The SAMs, which acted as barriers to moisture, were prepared by immersing the substrate in a pentafluorobenzenethiol (PFBT) solution under ambient temperature (25 °C). In this study, we investigated the electrochemical migration phenomenon using water drop testing, and the results showed that the formation of dendrites connecting the cathode and the anode, which can affect the electrochemical reliability of an electric device, was suppressed in the presence of the SAMs...
April 17, 2018: ACS Applied Materials & Interfaces
Yunnan Fang, Mitra Akbari, Jimmy G D Hester, Lauri Sydänheimo, Leena Ukkonen, Manos M Tentzeris
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
April 16, 2018: Scientific Reports
Shawkat Ali, Arshad Hassan, Gul Hassan, Chang-Ho Eun, Jinho Bae, Chong Hyun Lee, In-Jung Kim
A novel disposable all-printed electronic biosensor is proposed for a fast detection and classification of bacteria. This biosensor is applied to classify three types of popular pathogens: Salmonella typhimurium, and the Escherichia coli strains JM109 and DH5-α. The proposed sensor consists of inter-digital silver electrodes fabricated through an inkjet material printer and silver nanowires uniformly decorated on the electrodes through the electrohydrodynamic technique on a polyamide based polyethylene terephthalate substrate...
April 12, 2018: Scientific Reports
Qing Zhang, Shuangshuang Shao, Zheng Chen, Vincenzo Pecunia, Kai Xia, Jianwen Zhao, Zheng Cui
A self-aligned inkjet printing process has been developed to construct small channel metal oxide (a-IGZO) thin-film transistors (TFTs) with independent bottom gates on transparent glass substrates. Poly(methylsilsesquioxane) (PMSQ) was used to pattern hydrophobic banks on the transparent substrate instead of commonly used self-assembled octadecyltrichlorosilane (OTS). Photolithographic exposure from backside using bottom gate electrodes as mask formed hydrophilic channel areas for the TFTs. IGZO ink was selectively deposited by an inkjet printer in the hydrophilic channel region and confined by the hydrophobic bank structure, resulting in the precise deposition of semiconductor layers just above the gate electrodes...
April 12, 2018: ACS Applied Materials & Interfaces
Zhaofei Chai, Can Wang, Jinfeng Wang, Fan Liu, Yujun Xie, Yong-Zheng Zhang, Jian-Rong Li, Qianqian Li, Zhen Li
Purely organic materials with the characteristic of room-temperature phosphorescence (RTP) under ambient conditions demonstrate potential benefits in advanced optoelectronic applications. Exploration of versatile and efficient RTP compounds with low prices is full of challenges due to the slow intersystem crossing process and ultrafast deactivation of the active excited states of organic compounds. Here, a series of boron-containing phosphors were found to present RTP with long-lived lifetimes. Among these commercially available and cheap compounds, (4-methoxyphenyl)boronic acid (PBA-MeO) exhibits long-lived RTP, with a lifetime of 2...
December 1, 2017: Chemical Science
Weifei Zhang, Nan Li, Daisuke Koga, Yong Zhang, Hulie Zeng, Hizuru Nakajima, Jin-Ming Lin, Katsumi Uchiyama
We report on the development of a novel and flexible on-line digital PCR (dPCR) system. The system was composed of three parts: an inkjet for generating the droplets, a coiled fused-silica capillary for thermal cycling and a laser induced fluorescence detector (LIFD) for positive droplet counting. Upon inkjet printing, monodisperse droplets were continu-ously generated in the oil phase and then introduced into the capillary in the form of a stable dispersion. The droplets containing one or zero molecules of target DNA passed through the helical capillary that was attached to a cylindrical thermal cycler for PCR amplification, resulting in the generation of fluorescence for the DNA-positive droplet...
March 29, 2018: Analytical Chemistry
Laura M Ferrari, Sudha Sudha, Sergio Tarantino, Roberto Esposti, Francesco Bolzoni, Paolo Cavallari, Christian Cipriani, Virgilio Mattoli, Francesco Greco
Electrically interfacing the skin for monitoring personal health condition is the basis of skin-contact electrophysiology. In the clinical practice the use of stiff and bulky pregelled or dry electrodes, in contrast to the soft body tissues, imposes severe restrictions to user comfort and mobility while limiting clinical applications. Here, in this work dry, unperceivable temporary tattoo electrodes are presented. Customized single or multielectrode arrays are readily fabricated by inkjet printing of conducting polymer onto commercial decal transfer paper, which allows for easy transfer on the user's skin...
March 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Juliana Oliveira, Vitor Correia, Enrico Sowade, Ikerne Etxebarria, Raul D Rodriguez, Kalyan Yoti Mitra, Reinhard R Baumann, Senentxu Lanceros-Méndez
Organic photodetectors based on printing technologies will allow to expand the current field of photodetector applications towards large-area and flexible applications in areas such as medical imaging, security and quality control, among others. Inkjet printing is a powerful digital tool for the deposition of smart and functional materials on various substrates, allowing the development of electronic devices such as photodetectors on various substrates. In this work, inkjet-printed photodetector array, based on organic thin-film transistor (OTFT) architecture, have been developed and applied for the indirect detection of X-ray radiation using a scintillator ink as X-ray absorber...
March 27, 2018: ACS Applied Materials & Interfaces
Yue Zhang, Tingting Ren, Junhui He
Papers' intrinsic interconnected porous structures and hydrophilic properties usually results in difficulty and complexity in partial functionalization and regulation processes because the capillary effect may lead to the fast diffusion of modifiers from one side to the other. Here, we report a simple and innovative inkjet printing approach that led to precise hydrophobic functionalization controllable in both planar and steric dimensions. Fabrication of Janus superwetting papers and superwettable patterned papers with high precision was achieved by computer-controlled inkjet printing...
March 26, 2018: ACS Applied Materials & Interfaces
Carolina C Ilie, Francisco Guzman, Benjamin Swanson, Ian Evans, Paulo Costa, Jacob Teeter, Mikhail Shekhirev, Nicole Benker, Sharmin Sikich, Axel Enders, Peter A Dowben, Alexander Sinitskii, Andrew J Yost
Photoactive perovskite quantum dot films, deposited via an inkjet printer, have been characterized by X-ray diffraction and X-ray photoelectron spectroscopy. The crystal structure and bonding environment are consistent with CsPbBr3 perovskite quantum dots. The current-voltage (I-V) and capacitance-voltage (C-V) transport measurements indicate that the photo-carrier drift lifetime can exceed 1 millisecond for some printed perovskite films. This far exceeds the dark drift carrier lifetime, which is below 50 nanoseconds...
March 26, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Tal Shpigel, Almog Uziel, Dan Y Lewitus
This paper describes a simple, straightforward, and rapid method for producing microspheres from molten polymers by merely printing them in an inkjet-like manner onto a superoleophobic surface. Similar to 3D printing, a polymer melt is deposited onto a surface; however, in contrast to 2D or 3D printing, the surface is not wetted (i.e. exhibiting high contact angles with liquids, above 150°, due to its low surface energy), resulting in the formation of discrete spherical microspheres. In this study, microspheres were printed using polycaprolactone and poly(lactic-co-glycolic acid) loaded with a model active pharmaceutical ingredient-ibuprofen (IBU)...
March 22, 2018: European Journal of Pharmaceutics and Biopharmaceutics
Meng Gao, Minxuan Kuang, Lihong Li, Meijin Liu, Libin Wang, Yanlin Song
Magnetosensing is a ubiquitous ability for many organism species in nature. 1D assembly, especially that arranged in single-particle-resolution regulation, is able to sense the direction of magnetic field depending on the enhanced dipolar interaction in the linear orientation. Inspired by the magnetosome structure in magnetotactic bacteria, a 1D assembly array of single particle resolution with controlled length and well-behaved configuration is prepared via inkjet printing method assisted with magnetic guiding...
March 25, 2018: Small
Michael Esseling, Christina Alpmann, Jens Schnelle, Robert Meissner, Cornelia Denz
Conical refraction (CR) optical bottle beams for photophoretic trapping of airborne absorbing droplets are introduced and experimentally demonstrated. CR describes the circular split-up of unpolarised light propagating along an optical axis in a biaxial crystal. The diverging and converging cones lend themselves to the construction of optical bottle beams with flexible entry points. The interaction of single inkjet droplets with an open or partly open bottle beam is shown implementing high-speed video microscopy in a dual-view configuration...
March 22, 2018: Scientific Reports
P He, J R Brent, H Ding, J Yang, D J Lewis, P O'Brien, B Derby
Fully printed humidity sensors based on two-dimensional (2D) materials are described. Monolayer graphene oxide (GO) and few-layered black phosphorus (BP) flakes were dispersed in low boiling point solvents suitable for inkjet printing. The humidity sensors were fabricated by printing GO and BP sensing layers on printed silver nanoparticle electrodes. The electrical response of the GO and BP sensors to humidity levels ranges from 11 to 97% relative humidity, which revealed a high capacitance sensitivity of 4...
March 22, 2018: Nanoscale
Jeong In Kim, Cheol Sang Kim
The cells respond to their microenvironment which is comparable size to the cells. The macroscale features of three dimensional (3D) printing struts (PS) typically result in whole cell contact guidance (CCG). In contrast, at the nanoscale, where features are similar size to receptors of the cells, the response of cells is more complex. In detail, integrin that is one of the cellular receptors involved with cell adhesion is recognized as communication channels through that the cells interact with adjacent surface features...
March 21, 2018: ACS Applied Materials & Interfaces
Cristiane Patricia Pissinato Pere, Sophia N Economidou, Gurprit Lall, Clémentine Ziraud, Joshua S Boateng, Bruce D Alexander, Dimitrios A Lamprou, Dennis Douroumis
In this study, polymeric microneedle patches were fabricated by stereolithography, a 3D printing technique, for the transdermal delivery of insulin. A biocompatible resin was photopolymerized to build pyramid and cone microneedle designs followed by inkjet print coating of insulin formulations., trehalose and xylitol were used as drug carriers with the aim to preserve insulin integrity and stability but also facilitate rapid release rates. Circular dichroism and Raman analysis demonstrated that all carriers maintained the native form of insulin with xylitol presenting the best performance...
March 16, 2018: International Journal of Pharmaceutics
Monica Sanna, Giovanna Sicilia, Ali Alazzo, Nishant Singh, Francesca Musumeci, Silvia Schenone, Keith A Spriggs, Jonathan C Burley, Martin C Garnett, Vincenzo Taresco, Cameron Alexander
A miniaturized assay was optimized to evaluate the enhanced apparent water solubility of pyrazolo[3,4- d ]pyrimidine derivatives used extensively as anticancer drug scaffolds. The applied amount of drugs used in the reported strategy ranged from 5 to 10 μg per formulation which were dispensed by an inkjet 2D printer directly into a 96-well plate. The selected polymer/drug formulations with high water solubility demonstrated improved cytotoxicity against a human lung adenocarcinoma cancer cell line (A549) compared to the free drugs...
March 8, 2018: ACS Medicinal Chemistry Letters
Mathias Schlenk, Eddie Hofmann, Susanne Seibt, Sabine Rosenfeldt, Lukas Schrack, Markus Drechsler, Andre Rothkirch, Wiebke Ohm, Josef Breu, Stephan Gekle, Stephan Förster
Liquid micro-jets play a key role in fiber spinning, inkjet printing and coating processes. In all these applications, the liquid jets carry dispersed particles whose spatial and orientational distributions within the jet critically influence the properties of the fabricated structures. Despite its importance, there is currently no knowledge about the orientational distribution of particles within micro-jets and droplets. Here we demonstrate a microfluidic device that allows to de-termine the local particle distribution and orientation by X-ray scattering...
March 12, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
John A Hondred, Joyce Breger, Nathan Alves, Scott A Trammell, Scott A Walper, Igor L Medintz, Jonathan C Claussen
Solution phase printing of graphene-based electrodes has recently become an attractive low-cost, scalable manufacturing technique to create in-field electrochemical biosensors. Here we report a graphene-based electrode developed via Inkjet Maskless Lithography (IML) for the direct and rapid monitoring of triple-O linked phosphonate organophosphates (OPs); these constitute the active compounds found in chemical warfare agents and pesticides that exhibit acute toxicity as well as long-term pollution to soils and waterways...
March 5, 2018: ACS Applied Materials & Interfaces
Sofia Safaryan, Vladislav Slabov, Svitlana Kopyl, Konstantin Romanyuk, Igor Bdikin, Semen Vasilev, Pavel Zelenovskiy, Vladimir Ya Shur, Evgeny A Uslamin, Evgeny Pidko, Alexander Vinogradov, Andrei Leonidovitch Kholkin
Peptide-based nanostructures are very promising for nanotechnological applications due to their excellent self-assembly properties, biological and chemical flexibility, and unique multifunctional performance. However, one of the limiting factors for the integration of peptide assemblies into functional devices is poor control of their alignment and other geometrical parameters required for device fabrication. In this work, we report a novel method for the controlled deposition of one of the representative self-assembled peptides - diphenylalanine (FF) - using a commercial inkjet printer...
March 2, 2018: ACS Applied Materials & Interfaces
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