BSc Z. Zong

1. FLEXIBLE HIGH-SENSITIVITY STRAIN SENSOR FABRICATED WITH PDMS MICRO-CHANNEL ARRAY USING LASE
   Shaogang Wang; Qihang Zong; Huiru Yang; Qianming Huang; Huaiyu Ye; Paddy French;
   In IEEE (Ed.), IEEE MEMS 2024,
   IEEE, January 2024.
   
   Keywords: ...

   Stretchable strain sensor, Metal film, UV laser, Laser transmission pyrolysis, PDMS pattering.
   
   
   Abstract: ...

   In recent years, flexible strain sensors based on metal cracks have garnered significant interest for their exceptional sensitivity. However, striking a balance between sensitivity and detection range remains a significant challenge, which often limits its wider application. Herein, we introduce an innovative laser transmission pyrolysis technology to fabricate high performance flexible strain sensors based on (Au) metal cracks with a microchannel array on the PDMS surface. The fabricated flexible strain sensors exhibit high sensitivity, wide detection range, precise strain resolution,fast response and recovery times, and robust durability. Furthermore, this technology has potential applications in microfluidics, microelectromechanical systems and optical sensing.

2. Rapid Fabrication of High-Performance Flexible Pressure Sensors Using Laser Pyrolysis Direct Writing
   Shaogang Wang; Qihang Zong; Huiru Yang; Chunjian Tan; Qianming Huang; Xu Liu; Guoqi Zhang; Paddy French; Huaiyu Ye;
   Applied Materials and Interfaces,
   2023. DOI: https://doi.org/10.1021/acsami.3c04290
   
   Keywords: ...

   flexible pressure sensor, UV laser, laser direct writing, continuous laser pyrolysis, PDMS, micro-truncated pyramid.
   
   
   Abstract: ...

   The fabrication of flexible pressure sensors with low cost, high scalability, and easy fabrication is an essential driving force in developing flexible electronics, especially for high-performance sensors that require precise surface microstructures. However, optimizing complex fabrication processes and expensive microfabrication methods remains a significant challenge. In this study, we introduce a laser pyrolysis direct writing technology that enables rapid and efficient fabrication of high-performance flexible pressure sensors with a microtruncated pyramid array. The pressure sensor demonstrates exceptional sensitivities, with the values of 3132.0, 322.5, and 27.8 kPa−1 in the pressure ranges of 0−0.5, 0.5−3.5, and 3.5−10 kPa, respectively. Furthermore, the sensor exhibits rapid response times (loading: 22 ms, unloading: 18 ms) and exceptional reliability, enduring over 3000 pressure loading and unloading cycles. Moreover, the pressure sensor can be easily integrated into a sensor array for spatial pressure distribution detection. The laser pyrolysis direct writing technology introduced in this study presents a highly efficient and promising approach to designing and fabricating high-performance flexible pressure sensors utilizing micro-structured polymer substrates.

3. High-Performance Flexible Strain Sensor Fabricated Using Laser Transmission Pyrolysis
   Shaogang Wang; Huiru Yang; Qihang Zong; Qianming Huang; Chunjian Tan; Chenshan Gao; Shizhen Li; Huaiyu Ye; Guoqi Zhangand; Paddy French;
   IEEE Sensors Journal,
   2023. DOI: doi: 10.1109/JSEN.2023.3337233
   
   Keywords: ...

   Stretchable strain sensors, Metal film, UV laser, Laer transmission pyrolysis, PDMS pattering..
   
   
   Abstract: ...

   In recent years, metal crack-based stretchable flexible strain sensors have attracted significant attention in wearable device applications due to their extremely high sensitivity. However, the trade-off between sensitivity and detection range has been an intractable dilemma, severely limiting their practical applications. Herein, we propose a laser transmission pyrolysis technology for fabricating high-performance flexible strain sensors based on (Au) metal cracks with the microchannel array on the polydimethylsiloxane (PDMS) surface. The fabricated flexible strain sensors exhibit high sensitivity (gauge factor of 2448), wide detection range (59% for tensile strain), precise strain resolution (0.1%), fast response and recovery times (69 ms and 141 ms), and robust durability (over 3000 cycles). In addition, experiment and simulation results reveal that introducing a microchannel array enables the stress distribution strategy on the sensor surface, which significantly improves the sensing sensitivity compared to conventional flat surface sensors. Based on the excellent performance, the sensors are applied to detect subtle physiological signals such as pulse and swallowing, as well as to monitor large-scale motion signals such as knee flexion and finger bending, demonstrating their potential applications in health monitoring, human-machine interactions, and electronic skin

4. A Low-Spur Fractional-N PLL Based on a Time-Mode Arithmetic Unit
   Gao, Zhong; He, Jingchu; Fritz, Martin; Gong, Jiang; Shen, Yiyu; Zong, Zhirui; Chen, Peng; Spalink, Gerd; Eitel, Ben; Alavi, Morteza S.; Staszewski, Robert Bogdan; Babaie, Masoud;
   IEEE Journal of Solid-State Circuits,
   pp. 1-20, 2022. DOI: 10.1109/JSSC.2022.3209338

5. A 2.6-to-4.1GHz Fractional-N Digital PLL Based on a Time-Mode Arithmetic Unit Achieving -249.4dB FoM and -59dBc Fractional Spurs
   Gao, Zhong; He, Jingchu; Fritz, Martin; Gong, Jiang; Shen, Yiyu; Zong, Zhirui; Chen, Peng; Spalink, Gerd; Eitel, Ben; Yamamoto, Ken; Staszewski, Robert Bogdan; Alavi, Morteza S.; Babaie, Masoud;
   In 2022 IEEE International Solid- State Circuits Conference (ISSCC),
   pp. 380-382, 2022. DOI: 10.1109/ISSCC42614.2022.9731561

6. Flexible and Highly Sensitive Pressure Sensor Based on Patterned PDMS Forming with Laser Pyrolysis Direct Write Technique for Wearable Electr
   Shaogang Wang; Qihang Zong; Chunjian Tan; Huaiyu Ye; Paddy French;
   In MNE 2022,
   September 2022.

7. A supply pushing reduction technique for LC oscillators based on ripple replication and cancellation
   Chen, Yue; Liu, Yao-Hong; Zong, Zhirui; Dijkhuis, Johan; Dolmans, Guido; Staszewski, Robert Bogdan; Babaie, Masoud;
   IEEE Journal of Solid-State Circuits,
   Volume 54, Issue 1, pp. 240--252, 2019.

8. A 60 GHz Frequency Generator Based on a 20 GHz Oscillator and an Implicit Multiplier
   Z. Zong; M. Babaie; R. B. Staszewski;
   IEEE Journal of Solid-State Circuits,
   Volume 51, Issue 5, pp. 1261-1273, May 2016. DOI: 10.1109/JSSC.2016.2528997
   
   Keywords: ...

   CMOS digital integrated circuits;field effect MIMIC;frequency multipliers;millimetre wave frequency convertors;millimetre wave oscillators;phase noise;FoM;PN performance;digital CMOS process;extraction techniques;figure-of-merit;frequency 20 GHz;frequency 57.8 GHz;frequency 60 GHz;frequency generator;frequency tuning range;implicit multiplier;local oscillator signal;mm-wave frequency generation technique;phase detection;phase noise performance;phase-locked loop;power efficiency;size 40 nm;third-harmonic boosting techniques;Boosting;Frequency conversion;Harmonic analysis;Oscillators;Phase locked loops;Power demand;Resonant frequency;60 GHz;60 GHz;PLL;frequency divider;harmonic boosting;harmonic extraction;implicit multiplier;mm-wave;oscillator;phase noise (PN);transformer.

9. An Implantable Stimulator With Safety Sensors in Standard CMOS Process for Active Books
   Liu, Xiao; Valente, Virgilio; Zong, Zhulin; Jiang, Dai; Donaldson, Nick; Demosthenous, Andreas;
   IEEE Sensors Journal,
   Volume 16, Issue 19, pp. 7161--7172, October 2016. DOI: 10.1109/JSEN.2016.2577688
   document

10. A 60 GHz 25% tuning range frequency generator with implicit divider based on third harmonic extraction with 182 dBc/Hz FoM
    Z. Zong; M. Babaie; R. B. Staszewski;
    In 2015 IEEE Radio Frequency Integrated Circuits Symposium (RFIC),
    pp. 279-282, May 2015.

BibTeX support