@article{wu_soltani_sennik_zhou_mackertich-sengerdy_whiting_werner_jur_2022, title={Design of Quasi-Endfire Spoof Surface Plasmon Polariton Leaky-Wave Textile Wearable Antennas}, volume={10}, ISSN={["2169-3536"]}, DOI={10.1109/ACCESS.2022.3218217}, abstractNote={A new design for a quasi-endfire spoof surface plasmon polariton (SSPP) leaky-wave antenna (LWA) is presented for wearable application. The antenna consists of an ultra-thin corrugated metallic structure screen-printed on a flexible textile substrate, which supports extremely confined spoof surface plasmon polaritons. To enable a highly directional leaky mode, two unit-cell designs with different surface impedances are incorporated to realize binary perturbations on the in-plane wavenumber. An auto-adaptive multi-objective optimizer (MOO) is utilized to intelligently design the surface impedance configuration, which achieves significant dimensional reduction compared to the periodically modified SSPP LWAs. A final miniaturized version with 28-unit-cells achieved about 70% size reduction in comparison to the longer design of 75 unit-cells. For proof of concept, the antenna is designed and optimized for operation at 6 GHz. A bandwidth of >200 MHz (5.90 GHz - 6.13 GHz) is achieved, centered around 6 GHz, for which the highly directional endfire pattern can be tilted to 22° and 14° for the 28 and 75 unit-call designs, respectively. The measured results agree well with the simulations. Meanwhile, experimental results show that the Specific Absorption Rate (SAR) is lower than 1.6 W/kg standard when the antenna is 2 mm away from the human phantom. This textile-based antenna realized with advanced screen-printing technology is extremely suitable for garment integration due to its high flexibility, low-profile, good fabrication accuracy, and robustness in its performance.}, journal={IEEE ACCESS}, author={Wu, Yuhao and Soltani, Saber and Sennik, Busra and Zhou, Ying and Mackertich-Sengerdy, Galestan and Whiting, Eric B. and Werner, Douglas H. and Jur, Jesse S.}, year={2022}, pages={115338–115350} }
 @article{yan_zhou_cheng_orenstein_zhu_yildiz_bradford_jur_wu_dirican_et al._2022, title={Interconnected cathode-electrolyte double-layer enabling continuous Li-ion conduction throughout solid-state Li-S battery}, volume={44}, ISSN={["2405-8297"]}, DOI={10.1016/j.ensm.2021.10.014}, abstractNote={All-solid-state lithium (Li) batteries with high energy density are a promising solution for the next-generation energy storage systems in large-scale devices. To simultaneously overcome the challenges of poor ionic conduction of solid electrolytes and shuttling of active materials, we introduce a functional electrolyte-cathode bilayer framework with interconnected LLAZO channels from the electrolyte into the cathode for advanced solid-state Li-S batteries. Differing from the traditional solid-state batteries with separated layer compositions, the introduced bilayer framework provides ultrafast and continuous ion/electron conduction. Instead of transferring Li+ across the polymer and garnet phases which involve huge interfacial resistance, Li+ is directly conducted through the LLAZO channels created continuously from the cathode layer to the solid electrolyte layer, significantly shortening the diffusion distance and facilitating the redox reaction of sulfur and sulfides. A stable cycle life is demonstrated in the prototype Li-S solid-state batteries assembled with the introduced [email protected] interconnected bilayer framework. High capacity is obtained at room temperature, indicating the superior electrochemical properties of the bilayer framework that result from the unique design of the interconnected LLAZO garnet phase.}, journal={ENERGY STORAGE MATERIALS}, author={Yan, Chaoyi and Zhou, Ying and Cheng, Hui and Orenstein, Raphael and Zhu, Pei and Yildiz, Ozkan and Bradford, Philip and Jur, Jesse and Wu, Nianqiang and Dirican, Mahmut and et al.}, year={2022}, month={Jan}, pages={136–144} }
 @article{li_reese_ingram_huddleston_jenkins_zaets_reuter_grogg_nelson_zhou_et al._2022, title={Textile-Integrated Liquid Metal Electrodes for Electrophysiological Monitoring}, volume={7}, ISSN={["2192-2659"]}, url={https://doi.org/10.1002/adhm.202200745}, DOI={10.1002/adhm.202200745}, abstractNote={Abstract}, journal={ADVANCED HEALTHCARE MATERIALS}, author={Li, Braden M. and Reese, Brandon L. and Ingram, Katherine and Huddleston, Mary E. and Jenkins, Meghan and Zaets, Allison and Reuter, Matthew and Grogg, Matthew W. and Nelson, M. Tyler and Zhou, Ying and et al.}, year={2022}, month={Jul} }
 @article{li_ju_zhou_knowles_rosenberg_flewwellin_kose_jur_2021, title={Airbrushed PVDF-TrFE Fibrous Sensors for E-Textiles}, volume={3}, ISSN={["2637-6113"]}, url={https://doi.org/10.1021/acsaelm.1c00802}, DOI={10.1021/acsaelm.1c00802}, abstractNote={The low-temperature processing, inherent flexibility, and biocompatibility of piezoelectric polymers such as poly(vinylidene fluoride) (PVDF)-based materials enable the creation of soft wearable sensors, energy harvesters, and actuators. Of the various processing techniques, electrospinning is the most widely adopted process to form PVDF nanofiber scaffolds with enhanced piezoelectric properties such that they do not require further post-processing such as mechanical drawing, electrical poling, or thermal annealing. However, electrospinning requires long periods of time to form sufficiently thick PVDF nanofiber scaffolds and requires extremely high voltages to form scaffolds with enhanced piezoelectric properties, which limits the number of usable substrates, thus restricting the integration and use of electrospun PVDF scaffolds into wearable textile platforms. In this work, we propose a facile processing technique to airbrush PVDF–trifluoroethylene (TrFE) nanofiber scaffolds directly onto textile substrates. We tune the polymer concentration (4, 6, and 8 wt %) and the spray distance (5, 12.5, and 20 cm) to understand their effects on the morphology and crystal structure of the fibrous scaffolds. The characterization results show that increasing the polymer wt % encourages the formation of fibrous morphologies and a β-phase crystal structure. We then demonstrate how the airbrushed PVDF–TrFE scaffolds can be easily integrated onto conductive inkjet-printed nonwoven textile substrates to form airbrushed piezoelectric textile devices (APTDs). The APTDs exhibit maximum open-circuit voltages of 667.1 ± 162.1 mV under tapping and 276.9 ± 59.0 mV under bending deformations. The APTDs also show an areal power density of 0.04 μW/cm2, which is 40× times higher compared to previously reported airbrushed PVDF scaffolds. Lastly, we sew APTDs into wearable textile platforms to create fully textile-integrated devices with applications in sensing a basketball shooting form.}, number={12}, journal={ACS APPLIED ELECTRONIC MATERIALS}, publisher={American Chemical Society (ACS)}, author={Li, Braden M. and Ju, Beomjun and Zhou, Ying and Knowles, Caitlin G. and Rosenberg, Zoe and Flewwellin, Tashana J. and Kose, Furkan and Jur, Jesse S.}, year={2021}, month={Dec}, pages={5307–5326} }
 @article{kim_ju_zhou_li_jur_2021, title={Microstructures in All-Inkjet-Printed Textile Capacitors with Bilayer Interfaces of Polymer Dielectrics and Metal-Organic Decomposition Silver Electrodes}, volume={13}, ISSN={["1944-8252"]}, url={https://doi.org/10.1021/acsami.1c01827}, DOI={10.1021/acsami.1c01827}, abstractNote={Soft printed electronics exhibit unique structures and flexibilities suited for a plethora of wearable applications. However, forming scalable, reliable multilayered electronic devices with heterogeneous material interfaces on soft substrates, especially on porous and anisotropic structures, is highly challenging. In this study, we demonstrate an all-inkjet-printed textile capacitor using a multilayered structure of bilayer polymer dielectrics and particle-free metal-organic decomposition (MOD) silver electrodes. Understanding the inherent porous/anisotropic microstructure of textiles and their surface energy relationship was an important process step for successful planarization. The MOD silver ink formed a foundational conductive layer through the uniform encapsulation of individual fibers without blocking fiber interstices. Urethane-acrylate and poly(4-vinylphenol)-based bilayers were able to form a planarized dielectric layer on polyethylene terephthalate textiles. A unique chemical interaction at the interfaces of bilayer dielectrics performed a significant role in insulating porous textile substrates resulting in high chemical and mechanical durability. In this work, we demonstrate how textiles' unique microstructures and bilayer dielectric layer designs benefit reliability and scalability in the inkjet process as well as the use in wearable electronics with electromechanical performance.}, number={20}, journal={ACS APPLIED MATERIALS & INTERFACES}, publisher={American Chemical Society (ACS)}, author={Kim, Inhwan and Ju, Beomjun and Zhou, Ying and Li, Braden M. and Jur, Jesse S.}, year={2021}, month={May}, pages={24081–24094} }
 @article{zhou_soltani_li_wu_kim_soewardiman_werner_jur_2020, title={Direct-Write Spray Coating of a Full-Duplex Antenna for E-Textile Applications}, volume={11}, url={https://doi.org/10.3390/mi11121056}, DOI={10.3390/mi11121056}, abstractNote={Recent advancements in printing technologies have greatly improved the fabrication efficiency of flexible and wearable electronics. Electronic textiles (E-textiles) garner particular interest because of their innate and desirable properties (i.e., conformability, breathability, fabric hand), which make them the ideal platform for creating wireless body area networks (WBANs) for wearable healthcare applications. However, current WBANs are limited in use due to a lack of flexible antennas that can provide effective wireless communication and data transfer. In this work, we detail a novel fabrication process for flexible textile-based multifunctional antennas with enhanced dielectric properties. Our fabrication process relies on direct-write printing of a dielectric ink consisting of ultraviolet (UV)-curable acrylates and urethane as well as 4 wt.% 200 nm barium titanate (BT) nanoparticles to enhance the dielectric properties of the naturally porous textile architecture. By controlling the spray-coating process parameters of BT dielectric ink on knit fabrics, the dielectric constant is enhanced from 1.43 to 1.61, while preserving the flexibility and air permeability of the fabric. The novel combination textile substrate shows great flexibility, as only 2 N is required for a 30 mm deformation. The final textile antenna is multifunctional in the sense that it is capable of operating in a full-duplex mode while presenting a relatively high gain of 9.12 dB at 2.3 GHz and a bandwidth of 79 MHz (2.260–2.339 GHz) for each port. Our proposed manufacturing process shows the potential to simplify the assembly of traditionally complex E-textile systems.}, number={12}, journal={Micromachines}, publisher={MDPI AG}, author={Zhou, Ying and Soltani, Saber and Li, Braden M. and Wu, Yuhao and Kim, Inhwan and Soewardiman, Henry and Werner, Douglas H. and Jur, Jesse S.}, year={2020}, month={Nov}, pages={1056} }
 @article{tan_monks_huang_meng_chen_zhou_lim_würth_resch-genger_chen_2020, title={Efficient sub-15 nm cubic-phase core/shell upconversion nanoparticles as reporters for ensemble and single particle studies}, url={https://doi.org/10.1039/D0NR02172E}, DOI={10.1039/D0NR02172E}, abstractNote={A set of sub-15 nm ytterbium-enriched α-NaYbF4:Er3+@CaF2core/shell upconversion nanoparticles have been developed for both ensemble- and single particle-level imaging studies, presenting a high quantum yield of 0.77% at a low saturation power density of 110 W cm−2.}, journal={Nanoscale}, publisher={Royal Society of Chemistry (RSC)}, author={Tan, Meiling and Monks, Melissa-Jane and Huang, Dingxin and Meng, Yongjun and Chen, Xuewen and Zhou, Ying and Lim, Shuang-Fang and Würth, Christian and Resch-Genger, Ute and Chen, Guanying}, year={2020} }
 @article{low-profile strip-loaded textile antenna with enhanced bandwidth and isolation for full-duplex wearable applications_2020, url={http://dx.doi.org/10.1109/tap.2020.2989862}, DOI={10.1109/tap.2020.2989862}, abstractNote={A novel dual-port textile antenna with a low profile and enhanced bandwidth is proposed for 2.45 GHz IMS-band full-duplex wearable applications. The antenna is developed on a textile material by using an advanced screen-printing technology and, thus, exhibits a very good structural flexibility and a high manufacturing accuracy. To improve the bandwidths at the two input ports, an innovative method is introduced for the first time where two additional strips are incorporated into the antenna design. These additional strips are placed perpendicularly to the feed lines to generate another resonant frequency, which is then combined with the fundamental mode of the patch antenna, producing the second-order resonant properties with enhanced bandwidths. The proposed strips are also beneficial to significantly improve the isolation between the two channels/ports. To maintain a robust linkage, a study of structural deformation is carried out by bending the antenna along both the 0° and 45° directions. The experimental results also show that the antenna is robust to the human tissue loading, where the specific absorption rate (SAR) is lower than 0.37 W/kg when the antenna is fully attached. The measured results agree reasonably well with the simulations providing experimental verification of the design concept. The antenna is believed to be the first dual-mode textile antenna of its type which features a low profile, improved bandwidth, high isolation, and low cost, making it a good candidate for potential full-duplex wearable applications.}, journal={IEEE Transactions on Antennas and Propagation}, year={2020} }
 @article{kim_shahariar_ingram_zhou_jur_2019, title={Inkjet Process for Conductive Patterning on Textiles: Maintaining Inherent Stretchability and Breathability in Knit Structures}, volume={29}, ISSN={["1616-3028"]}, url={http://dx.doi.org/10.1002/adfm.201807573}, DOI={10.1002/adfm.201807573}, abstractNote={Abstract}, number={7}, journal={ADVANCED FUNCTIONAL MATERIALS}, publisher={Wiley}, author={Kim, Inhwan and Shahariar, Hasan and Ingram, Wade F. and Zhou, Ying and Jur, Jesse S.}, year={2019}, month={Feb} }
 @article{kirigami‐inspired textile electronics: k.i.t.e._2019, url={http://dx.doi.org/10.1002/admt.201900511}, DOI={10.1002/admt.201900511}, abstractNote={Abstract}, journal={Advanced Materials Technologies}, year={2019}, month={Nov} }
 @article{liu_zhou_guo_yang_félix_martel_qiu_ma_decher_2018, title={Fluorescence-enhanced bio-detection platforms obtained through controlled “step-by-step” clustering of silver nanoparticles}, volume={10}, DOI={10.1039/c7nr07486g}, abstractNote={A fluorescence-based bioassay platform prepared by using the versatile, scalable and cheap spray-assisted step-by-step assembly of silver nanoparticles.}, number={2}, journal={Nanoscale}, publisher={Royal Society of Chemistry (RSC)}, author={Liu, Panpan and Zhou, Ying and Guo, Min and Yang, Shuguang and Félix, Olivier and Martel, David and Qiu, Yiping and Ma, Ying and Decher, Gero}, year={2018}, pages={848–855} }