(6kc) Soft, Stretchable Wearable Platforms for Sensing and Energy Harvesting Applications
AIChE Annual Meeting
Sunday, October 28, 2018 - 1:00pm to 3:30pm
In addition to realizing new sensing platforms, developing viable wearable energy sources remain another key challenge hampering the widespread growth of the wearable sensors field. Most prior efforts rely on bulky coin batteries which severely compromise wearability. Efforts focused on developing thin, stretchable batteries and super capacitors address this issue but at the cost of limited energy capacity and frequent recharging. Various forms of wearable energy harvesters that harness energy from body heat, movement and sun demonstrate potential for powering wearable electronics. However, many of the energy harvesters and storage systems rely on toxic chemicals which pose serious health concerns. I describe the fabrication, characterization, and real-life application of a highly biocompatible, soft, stretchable electronic-skin-based biofuel cell (E-BFC) that scavenges energy from lactate present in human sweat. The E-BFC exhibits a power density of ~1.2 mWcm-2, representing the highest power density recorded by a wearable biofuel cell to date. Such performance is achieved via a unique combination of lithographically-patterned stretchable electronic framework and screen-printed, densely-packed three-dimensional carbonnanotube-based bioanode and cathode array arranged in a stretchable âisland-bridgeâ configuration. The E-BFC maintains its performance even under repeated strains of 50% and can power a Bluetooth Low Energy (BLE) radio. This is the first example of a wearable biofuel cell powering a BLE radio. Such systematic studies and demonstrations mark a significant breakthrough in the field of wearable biofuel cells.
Selected Publications: (Total papers: 38; H-index: 26; Total citations: 2583)
1. âBattery-free, skin-interfaced microfluidic/electronic system for simultaneous electrochemical, colorimetric & volumetric sweat analysisâ A. J. Bandodkar et al, Sci. Adv. (under review).
2. âSoft, stretchable, high power density electronic skin-based biofuel cells for scavenging energy from human sweatâ, A. J. Bandodkar, J.-M. You, N.-H. Kim, Y. Gu, R. Kumar, A. M. V. Mohan, J. Kurniawan, S. Imani, T. Nakagawa, B. Parish, M. Parthasarathy, P. P. Mercier, S. Xu and J. Wang, Energy Environ. Sci., 2017,10, 1581.
3. âAll-printed magnetically self-healing electrochemical devicesâ, A. J. Bandodkar, C. S. LÃ³pez, A. M. V. Mohan, L. Yin, R. Kumar and J Wang, Sci. Adv. 2016, 2, e1601465.
4. âA wearable chemicalâelectrophysiological hybrid biosensing system for real-time health and fitness monitoringâ, S. Imani, A. J. Bandodkar, V. Mohan, R. Kumar, S. Yu, J. Wang, P.P. Mercier, Nat. Commun. 2016, 7, 11650.
5. âHighly Stretchable Fully-Printed CNT-based Electrochemical Sensors and Biofuel Cells: Combining Intrinsic and Design-induced Stretchabilityâ, A. J. Bandodkar, I. Jeerapan, J. M. You, R. N. Flores and J. Wang, Nano Lett. 2016, 16, 721.
6. âAll-Printed Stretchable Electrochemical Devicesâ, A. J. Bandodkar, R. NuÃ±ez-Flores, W. Jia and J. Wang, Adv. Mat. 2015, 27, 3060.
Keywords: Wearable chemical sensors, biofuel cells, microfluidics, colorimetric assays, wireless electronics, printed devices.
Research Interests: Wearable chemical sensors, implantable chemical sensors, biofuel cells, batteries, energy harvesting, stretchable devices, self-healing systems.
Teaching Interests: Teachers and mentors are important pillars in oneâs success and I owe my accomplishments to the teachers in my past and present who instilled scientific curiosity in me, taught me technological skills, helped me overcome my weaknesses, and guided me in tackling challenging tasks. A major motivation for me to become a faculty is to partake into the noble gesture of teaching and guide young minds towards a successful, fruitful and content life. During my PhD and now as a postdoc, I have mentored 14 undergraduate students of which 4 are currently PhD students in top tier schools; 3 work in industry and 7 are currently pursing undergraduate degrees. I have also been a TA for two graduate level courses (~50 students in each course). Apart from helping students understand the concepts during office hours, I also taught the class when the concerned professor was travelling. Considering my ability to explain complex scientific concepts in a simple manner to people without STEM background and my passion to motivate people towards research, I was invited as a guest lecturer for an undergraduate course (~150 students) on âDesigning Informationâ at the UC San Diegoâs Fine Arts Department. During this lecture, I illustrated the different ways in which wearable devices offer an exciting avenue for achieving personalized Internet of Things and how these devices are having an impact in todayâs day and age. The overwhelming feedback and interest and curiosity ignited in the Fine Arts students, who before the lecture had given little thought to wearable devices and their impact, was quite satisfying to me. In fact, one of the students even collaborated with me on a project that combined chemical sensors with fine arts â a truly unique learning for both of us. In addition to these, I have also been invited as a speaker at the Universityâs undergraduate outreach events to motivate and encourage young minds to take up careers in the STEM fields.
As a faculty I would be thrilled to teach courses on mass and heat transfer, thermodynamics, electrochemistry, chemical sensors, nanobiotechnology and surface science. Additionally, I would be excited to be involved in committees focused on increasing student participation in STEM fields.