9 research outputs found
320-nm Flexible Solution-Processed 2,7-dioctyl[1] benzothieno[3,2-b]benzothiophene Transistors
Flexible organic thin-film transistors (OTFTs) have received extensive attention due to their outstanding advantages such as light weight, low cost, flexibility, large-area fabrication, and compatibility with solution-processed techniques. However, compared with a rigid substrate, it still remains a challenge to obtain good device performance by directly depositing solution-processed organic semiconductors onto an ultrathin plastic substrate. In this work, ultrathin flexible OTFTs are successfully fabricated based on spin-coated 2,7-dioctyl[1]benzothieno[3,2-b]benzothiophene (C8-BTBT) films. The resulting device thickness is only ~320 nm, so the device has the ability to adhere well to a three-dimension curved surface. The ultrathin C8-BTBT OTFTs exhibit a mobility as high as 4.36 cm2 Vâ1 sâ1 and an on/off current ratio of over 106. These results indicate the substantial promise of our ultrathin flexible C8-BTBT OTFTs for next-generation flexible and conformal electronic devices
Radiomics Combined with Multiple Machine Learning Algorithms in Differentiating Pancreatic Ductal Adenocarcinoma from Pancreatic Neuroendocrine Tumor: More Hands Produce a Stronger Flame
The aim of this study was to assess the diagnostic ability of radiomics combined with multiple machine learning algorithms to differentiate pancreatic ductal adenocarcinoma (PDAC) from pancreatic neuroendocrine tumor (pNET). This retrospective study included a total of 238 patients diagnosed with PDAC or pNET. Using specialized software, radiologists manually mapped regions of interest (ROIs) from computed tomography images and automatically extracted radiomics features. A total of 45 discriminative models were built by five selection algorithms and nine classification algorithms. The performances of the discriminative models were assessed by sensitivity, specificity and the area under receiver operating characteristic curve (AUC) in the training and validation datasets. Using the combination of Gradient Boosting Decision Tree (GBDT) as the selection algorithm and Random Forest (RF) as the classification algorithm, the optimal diagnostic ability with the highest AUC was presented in the training and validation datasets. The sensitivity, specificity and AUC of the model were 0.804, 0.973 and 0.971 in the training dataset and 0.742, 0.934 and 0.930 in the validation dataset, respectively. The combination of radiomics and multiple machine learning algorithms showed the potential ability to discriminate PDAC from pNET. We suggest that multi-algorithm modeling should be considered for similar studies in the future rather than using a single algorithm empirically
Brittle PCDTPT Based Elastic Hybrid Networks for Transparent Stretchable SkinâLike Electronics
Abstract Organic semiconductors offer the opportunity to develop intrinsically stretchable skinâlike electronics for future applications. However, the lack of intrinsically stretchable materials is still a fundamental challenge, originating from the brittle nature of most organic semiconductors with the fracture strain at a few percent (95% at 550 nm), with mobility as high as 2.31 cm2Â Vâ1Â sâ1. The depthâdependence light absorption spectra and the conductive atomic force microscopy images in horizontal and vertical directions of the blend film confirm the nonuniform distribution of PCDTPT fibers with sandwiched structure, which weakens the effect of device configuration on mobility. Compared with the conventional uniform film, the sandwiched film weakens the effect of device configuration on mobility. The fully transparent stretchable transistors with the blend films show the outstanding ductility and high optical transparency. This work opens up a feasible path for brittle organic semiconductors used in the transparent stretchable transistor, presenting their promising potential in future seeâthrough skinâlike electronics
Significantly Reinforced Composite Fibers Electrospun from Silk Fibroin/Carbon Nanotube Aqueous Solutions
Microcomposite fibers of regenerated silk fibroin (RSF)
and multiwalled
carbon nanotubes (MWNTs) were successfully prepared by an electrospinning
process from aqueous solutions. A quiescent blended solution and a
three-dimensional Raman image of the composite fibers showed that
functionalized MWNTs (F-MWNTs) were well dispersed in the solutions
and the RSF fibers, respectively. Raman spectra and wide-angle X-ray
diffraction (WAXD) patterns of RSF/F-MWNT electrospun fibers indicated
that the composite fibers had higher ÎČ-sheet content and crystallinity
than the pure RSF electrospun fibers, respectively. The mechanical
properties of the RSF electrospun fibers were improved drastically
by incorporating F-MWNTs. Compared with the pure RSF electrospun fibers,
the composite fibers with 1.0 wt % F-MWNTs exhibited a 2.8-fold increase
in breaking strength, a 4.4-fold increase in Youngâs modulus,
and a 2.1-fold increase in breaking energy. Cytotoxicity test preliminarily
demonstrated that the electrospun fiber mats have good biocompatibility
for tissue engineering scaffolds
Discovery of a magnetic conductive interface in PbZr0.2Ti0.8O3 /SrTiO3 heterostructures.
Emergent physical properties often arise at interfaces of complex oxide heterostructures due to the interplay between various degrees of freedom, especially those with polar discontinuities. It is desirable to explore if these structures may generate pure and controllable spin currents, which are needed to attain unmatched performance and energy efficiency in the next-generation spintronic devices. Here we report the emergence of a spin-polarized two-dimensional electron gas (SP-2DEG) at the interface of two insulators, SrTiO3 and PbZr0.2Ti0.8O3. This SP-2DEG is strongly localized at the interfacial Ti atoms, due to the interplay between Coulomb interaction and band bending, and can be tuned by the ferroelectric polarization. Our findings open a door for engineering ferroelectric/insulator interfaces to create tunable ferroic orders for magnetoelectric device applications and provide opportunities for designing multiferroic materials in heterostructures