Article
Engineering, Electrical & Electronic
Xianghui Zeng, Minglu Hu, Pei He, Weikai Zhao, Sihan Dong, Xiaowen Xu, Guozhang Dai, Jia Sun, Junliang Yang
Summary: This article introduces a method using heat transfer printing technology to create robust conductive patterns on fabric substrates, resulting in a high conductivity and durable carbon-based electronic textile. The sensor can accurately reflect different degrees of finger bending and works well in waterproof situations. Additionally, five sensors were integrated into a fabric glove, which, combined with machine learning, can recognize 8 different gestures with an average accuracy of 96.58%.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Inhwan Kim, Beomjun Ju, Ying Zhou, Braden M. Li, Jesse S. Jur
Summary: The study demonstrates the successful fabrication of 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 porous/anisotropic microstructure of textiles and their surface energy relationship is crucial for successful planarization. The unique chemical interaction at the interfaces of bilayer dielectrics plays a significant role in insulating porous textile substrates and improving chemical and mechanical durability.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Shujie Li, Alex Kosek, Mohammad Naim Jahangir, Rajiv Malhotra, Chih-Hung Chang
Summary: A novel low-temperature printing method has been developed for creating wearable negative-temperature-coefficient thermistors on thermally sensitive fabrics. The method utilizes stable and printable ink to achieve a processing temperature of 120 degrees C.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Hong Hong, Jiyong Hu, Kyoung-Sik Moon, Xiong Yan, Ching-ping Wong
Summary: This study demonstrates the preparation of flexible and washable conductive circuits on textiles using UV-curable conductive ink, highlighting the correlation between ink formulation, rheological properties, screen printability, and electrical properties of the e-textiles. The research findings provide insights for ink formulation design and application in screen-printing electronics textiles.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Abiodun O. Komolafe, Helga Nunes-Matos, Monika Glanc-Gostkiewicz, Russel N. Torah
Summary: This paper investigates the reduction of interface layer thickness in printed e-textile devices, finding that using fabrics with high polyester content can significantly reduce the thickness of the interface layer and decrease the proportion of interface material to fabric thickness in printed e-textiles.
IEEE SENSORS JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Saiyin Hou, Haiqi Chen, Dong Lv, Wei Li, Xuelei Liu, Qiang Zhang, Xinhong Yu, Yanchun Han
Summary: Inkjet-printed conductive polymer PEDOT:PSS films have been developed as stretchable transparent electrodes in optoelectronic devices. By printing a formulated ink containing PEDOT:PSS, formamide, d-sorbitol, sodium dodecyl benzene sulfonate, and ethylene glycol, a uniform film with high conductivity and mechanical performance is achieved. The film shows a high conductivity of 1050 S/cm, sheet resistance of less than 145 omega/sq, and can maintain stability even after 200 cycles of stretching at 55% strain. The enhanced conductivity is due to the conformational transition of the backbone through secondary doping and post-treatment with formamide, as well as the removal of excess PSS components after phase separation.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Irena Ivanisevic, Marin Kovacic, Marko Zubak, Antonia Ressler, Sara Krivacic, Zvonimir Katancic, Iva Gudan Pavlovic, Petar Kassal
Summary: This work demonstrates the development of a silver nanoparticle-based functional ink for printing on flexible paper and plastic substrates. By improving the wetting properties of the silver nanoparticles, stable printing on different surfaces was achieved, followed by sintering using intense pulsed light. The silver nanoparticle ink shows great potential in the field of flexible electronics.
Article
Engineering, Manufacturing
Dengke Zhao, Hongzhao Zhou, Yifan Wang, Jun Yin, Yong Huang
Summary: This study investigates the dynamics and performance of droplet formation during DOD inkjet printing of viscoelastic ink, identifies four distinct droplet formation regimes, and proposes a dimensionless number to quantify the transition of droplet formation regimes. The effects of bipolar waveform parameters on droplet formation and precise control of conductive microlines and micropatterns printing under well-formed droplets are systematically examined. This research has the potential to enhance the understanding of droplet formation dynamics and improve the performance and function of inkjet-printed devices using viscoelastic inks.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Sahil P. Wankhede, Ali H. Alshehri, Xian Du
Summary: Flexible electronic devices are widely used in various industries, but their performance in harsh environments is a challenge. In this study, we developed flexible electronics for application in harsh environments using a fluororubber substrate and inkjet printing. The fabrication process involved surface pretreatment and multiple-layer printing to overcome challenges like surface energy mismatch and crack formation. The printed patterns were encapsulated by fluororubber to protect them, and the performance under harsh conditions was evaluated. The results showed negligible change in resistance and minimal degradation of the encapsulated patterns. This technique offers a simple solution for fabricating flexible electronics for harsh environments.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Shuyue Wang, Xiaoli Wu, Jiaxin Lu, Zhengwu Luo, Hui Xie, Xiaobin Zhang, Kaiwen Lin, Yuehui Wang
Summary: This study proposes a high concentration silver nanowires (AgNWs) conductive ink for inkjet printing, which enables the fabrication of flexible transparent conductive electrodes with low resistance and high transparency. The relationship between the printing layer and the conductivity, as well as the stability and thermal response of the electrode, are investigated. The results demonstrate the potential of inkjet-printed AgNWs-based flexible transparent conductive electrodes for developing flexible functional electronics.
Article
Chemistry, Physical
Chi Zhang, Lei Zhang, Zhihua Pu, Bo Bao, Wenyu Ouyang, Dachao Li
Summary: In this study, we propose the preparation of 1D stretchable fiber-shaped electronics via inkjet printing technology for wearable applications. Utilizing precision rotary inkjet printing equipment and surface chemical modification process, high-precision and customizable microfabrication onto ultra-low diameter fiber surfaces was achieved. The fabricating method is non-destructive and can prepare 1D stretchable conductors with remarkable conductivity and mechanical stability for practical applications.
Article
Chemistry, Physical
Guixin Wang, Rui Zhang, Hongqiong Zhang, Kui Cheng
Summary: Although significant development has been achieved in the inkjet-printing technology for scalable and adaptable energy storage devices, the search for additive-free and environmentally friendly aqueous inks remains a challenge. In this study, an aqueous MXene/sodium alginate-Fe2+ hybrid ink is prepared and used for inkjet printing micro-supercapacitors (MSCs). The ink is able to alleviate the oxidation and self-restacking problems of MXene and provides abundant active sites for ion storage and a highly conductive network for electron transfer. The inkjet-printed MSCs exhibit remarkable capacitances, good rate capability, high energy density, and excellent cycling and mechanical durability. Therefore, MXene/SA-Fe inks hold great potential for printable electronics.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Yuan Xiao, Qian Li, Chengkun Zhang, Wei Zhang, Weibo Yun, Leipeng Yang
Summary: Delivery of electronic functionality through smart textiles is crucial for the development of wearable electronics. In this study, a new method combining liquid phase chemical reduction and inkjet printing was used to fabricate electrical circuits on textile substrates. The resulting conductive layers showed high conductivity and were used to create textile capacitive sensors and electrocardiogram (ECG) electrodes with good response time and stability.
IEEE SENSORS JOURNAL
(2022)
Article
Biochemistry & Molecular Biology
Yuehui Wang, Xiaoli Wu, Ke Wang, Kaiwen Lin, Hui Xie, Xiaobing Zhang, Jingze Li
Summary: By investigating the factors influencing silver nanowire inkjet printing and fabricating flexible transparent conductive films on PET substrates, it was demonstrated that well-defined patterns with good photoelectric properties can be obtained.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Chemistry, Physical
Ben Niu, Su Yang, Tao Hua, Xiao Tian, MingKin Koo
Summary: Electronic textiles, a newly developed innovation combining textile and electronic technologies, show excellent durability, electrical conductivity, and potential for widespread applications in wearable electronics.
Article
Engineering, Electrical & Electronic
Firas Fatani, Mohammad Vaseem, Zubair Akhter, Rana Muhammad Bilal, Atif Shamim
Summary: The demand for highly sensitive, environmentally stable, mechanically flexible, and low-cost temperature sensors for on-body measurements has been increasing due to the popularity of personal healthcare-Internet-of-Things (H-IoT) devices. Printed Electronics (PE) is an ideal platform for such sensors as it allows for the production of flexible devices using simple and rapid methods at a relatively low cost. In this article, a custom-made tungsten-doped vanadium dioxide ink-based screen-printed temperature sensor with high resistance temperature coefficient (TCR) and environmental stability is reported. A fluoropolymer-based passivation layer is added to protect the sensor from the environment, and the sensor is integrated with a custom Bluetooth Low Energy (BLE) wireless readout in the form of a wristband.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Kirill Klionovski, Hanguang Liao, Sergey E. E. Bankov, Zubair Akhter, Atif Shamim
Summary: This article presents a planar millimeter-wave slot antenna array with SIW-based horn-reflector feeding. The dimensions of the SIW surface are optimized to minimize the size of the planar horn-reflector feeding, and a dual-slot radiating element is used to avoid scan blindness along the normal direction. Experimental results show that the prototype achieved +/- 17 degrees beam scanning within 16% of the operational frequency range, with no scan blindness along the normal direction.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Yiyang Yu, Zubair Akhter, Atif Shamim
Summary: An antenna-on-chip (AoC) with an artificial magnetic conductor (AMC) surface underneath is proposed to improve radiation efficiency and gain. However, the illumination issue limits the increase in gain with AMC area. To solve this problem, coupling enhancement structures (CESs) utilizing available metal layers are introduced. The proposed AMC-backed AoC with CES shows significant improvements in gain and radiation efficiency compared to a conventional AMC-backed AoC.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Ulan Myrzakhan, Farhan A. Ghaffar, Mohammad Vaseem, Hossein Fariborzi, Atif Shamim
Summary: Describes a completely vialess ferrite substrate-based waveguide phase shifter realized through low-cost inkjet printing technique, which allows the fabrication of a conventional rectangular waveguide on a standard magnetic substrate, improving the RF performance and enabling low-cost integration on printed circuit boards.
IEEE TRANSACTIONS ON MAGNETICS
(2023)
Article
Engineering, Electrical & Electronic
Xuecui Zou, Yiming Yang, Usman Yaqoob, Atif Shamim, Khaled Nabil Salama, Hossein Fariborzi
Summary: We propose a technique for modulating the nonlinear dynamics of a micro-beam using multiple structural capacitances. Our findings show that this technique significantly enhances the nonlinear motion of the resonator. By exciting one or more capacitance paths with the same input AC signals, the nonlinear resonance can be actuated, leading to effective modulation of the nonlinear frequency region. This paradigm provides an energy-efficient and straightforward solution for mechanical memory designs.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Farhan A. Ghaffar, Noben K. Roy, Atif Shamim
Summary: The increase of 7 GHz in the ISM band around 60 GHz has opened up possibilities for modern wireless applications like 5G. To cater to this large bandwidth, a large bandwidth, planar and high gain Vivaldi antenna design is presented. The antenna design allows for integration on the same conductor layer, mitigating the problem of thin gap between metal layers. The measured results show excellent matching performance and high gain, making it suitable for high data rate applications in a millimeter-wave transceiver system.
IET MICROWAVES ANTENNAS & PROPAGATION
(2023)
Article
Biotechnology & Applied Microbiology
Altynay Kaidarova, Nathan R. Geraldi, Rory P. Wilson, Juergen Kosel, Mark G. Meekan, Victor M. Eguiluz, Muhammad Mustafa Hussain, Atif Shamim, Hanguang Liao, Mani Srivastava, Swapnil Sayan Saha, Michael S. Strano, Xiangliang Zhang, Boon S. Ooi, Mark Holton, Lloyd W. Hopkins, Xiaojia Jin, Xun Gong, Flavio Quintana, Adylkhan Tovasarov, Assel Tasmagambetova, Carlos M. Duarte
Summary: Human societies rely on marine ecosystems, which are still experiencing degradation. This article discusses the adaptation of sensors and wearable technology developed for humans to improve marine monitoring. It highlights the barriers to transitioning this technology from land to sea, updates on sensor developments for ocean observation, and advocates for wider use of wearables on marine organisms. The authors propose that widespread use of wearables could contribute to an 'internet of marine life' and inform strategies for marine conservation and restoration.
NATURE BIOTECHNOLOGY
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Ruiqi Wang, Zubair Akhter, Atif Shamim
Summary: In this paper, the depolarizing Chipless RFID tags based on double-slit split-ring resonators (DSSRR) with single-layer and dual-layer configurations are investigated. The single-layer tag design can exhibit three resonant dips in the cross-polar spectrum with a thin substrate layer. The dual-layer tag design demonstrates four resonant peaks, enabling robust detection on absorptive or reflective platforms in a dynamic environment. An on-body experiment is performed to validate the wearability of the dual-layer tag. Both tags are fabricated through a fully printed process, which is cost-effective and suitable for mass manufacturing.
2023 IEEE RADIO AND ANTENNA DAYS OF THE INDIAN OCEAN, RADIO
(2023)
Article
Computer Science, Information Systems
Qassim Abdullahi, Mohammad Vaseem, Atif Shamim, George Goussetis, Dimitris E. Anagnostou
Summary: This study characterizes vanadium dioxide (VO2) using the time-resolved microwave conductivity (TRMC) method, which is suitable for applications requiring reconfigurable microwave frequency selection. The TRMC method is shown to be flexible in determining the microwave conductivity of thin film compounds of different thicknesses, whether they are phase-changing or non-phase changing. The method utilizes microwave resonant waveguides to examine the changes in microwave conductivity of thermally excited samples in response to microwave-transmitted power, represented by the system's sensitivity factor. The measurements reveal a low regime of microwave conductivity below the transition temperature (Tc) of VO2, associated with dielectric characteristics and shallow trap electron states, and a high thermally triggered microwave conductivity regime above Tc, where longer electron hops enhance charge mobility.
Proceedings Paper
Engineering, Electrical & Electronic
Oludayo Sokunbi, Hussein Attia, Abubakar Hamza, Atif Shamim, Ahmed A. Kishk
Summary: This study presents a low-cost innovative MIMO antenna configuration with minimal separation between the radiating elements and high isolation over a wide frequency band. The use of precisely designed slots on the radiating patches improves interelement isolation throughout the mm-wave band. The proposed self-isolation method achieves elements isolation better than 70 dB with a small inter-element spacing.
2023 INTERNATIONAL MICROWAVE AND ANTENNA SYMPOSIUM, IMAS
(2023)
Article
Engineering, Electrical & Electronic
Ruiqi Wang, Kirill Klionovski, Atif Shamim
Summary: This paper proposes a theoretical model based on annular ring currents to synthesize quasi-isotropic antenna radiation patterns. The model shows that wideband radiation isotropy can be achieved by optimizing the combination of azimuthal currents. Spherical and cubical electrically small antenna designs with wide impedance and radiation isotropy bandwidths exceeding 10% for the GSM900 band are presented in this study.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Ruiqi Wang, Zubair Akhter, Weiwei Li, Atif Shamim
Summary: This work presents a cross-polar dual-layer chipless RFID tag with a ladder-shaped resonator design. The tag can be directly attached to human skin without performance deterioration due to an integrated ground plane. Simulation results show that the ladder-shaped resonator offers advantages such as a strong cross-polar radar cross section, third-order harmonics, and compact size. A fully printed fabrication process makes the proposed tag design suitable for mass production at a low cost.
IEEE JOURNAL OF RADIO FREQUENCY IDENTIFICATION
(2023)
Article
Energy & Fuels
Azamat Bakytbekov, Thang Q. Nguyen, Ge Zhang, Michael S. Strano, Khaled N. Salama, Atif Shamim
Summary: In a future green Internet of Things (IoT) reality, self-powered IoT devices are crucial. This study presents a multi-source energy harvester that collects ambient energy from radio frequency (RF) energy and thermal energy, providing ubiquitous and continuous power for IoT devices.
Article
Chemistry, Multidisciplinary
Bashaer A. Minyawi, Mohammad Vaseem, Nuha A. Alhebshi, Amal M. Al-Amri, Atif Shamim
Summary: In this research, a stable ink based on VO2 was synthesized and its charge storage mechanisms and performance were evaluated. The VO2/Au electrode showed double the capacitance of the VO2 electrode and the highest capacitance was observed in the Au electrode. An asymmetric supercapacitor was built using Au positive electrodes and VO2 negative electrodes, showing good electrochemical performance in the aqueous electrolyte.
Article
Engineering, Electrical & Electronic
Tejinder Singh, Gwendolyn Hummel, Mohammad Vaseem, Atif Shamim
Summary: This article provides an overview of the application of Chalcogenide Phase Change Materials (PCM) and metal insulator transition (MIT) materials in the field of radio frequency (RF), and discusses the recent advancements in reconfigurable millimeter-wave (mmWave) devices based on these materials in depth.
IEEE JOURNAL OF MICROWAVES
(2023)
Article
Engineering, Electrical & Electronic
Tonghui Li, Xiaofeng Duan, Kai Liu, Yongqing Huang
Summary: This paper proposes a hybrid genetic algorithm (HGA) to simplify the process of photodiode parameter extraction and compares its performance with other optimization algorithms. The results show that HGA has better performance in parameter fitting, convergence speed, and accuracy.
MICROELECTRONICS JOURNAL
(2024)
Article
Engineering, Electrical & Electronic
Prachuryya Subash Das, Deepjyoti Deb, Rupam Goswami, Santanu Sharma, Rajesh Saha
Summary: This article proposes the investigation of low power performance of a fin field-effect transistor (FinFET) with surrounding gates using a calibrated technology computer-aided design (TCAD) framework. The study explores the impact of core dimensions and gate edge suppression on the electrical parameters of the device. It is found that reducing the channel length by 35% improves the overall low power performance of the FinFET.
MICROELECTRONICS JOURNAL
(2024)
