Electronic Supplementary Material (ESI) for Journal of Materials Chemistry B. This journal is The Royal Society of Chemistry 2017 Electronic Supplemen

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1 Electronic Supplementary Material (ESI) for Journal of Materials Chemistry B. This journal is The Royal Society of Chemistry 2017 Electronic Supplementary Information Human Skin Interactive Self-powered Wearable Piezoelectric Bio-e-skin by Electrospun Poly-L-lactic Acid Nanofibers for Non-invasive Physiological Signal Monitoring Ayesha Sultana, Sujoy Kumar Ghosh, Vitor Sencadas,#, Tian Zheng, Michael Higgins, Tapas Ranjan Middya, Dipankar Mandal, * Organic Nano-Piezoelectric Device Laboratory, Department of Physics, Jadavpur University, Kolkata , India Australian Centre of Excellence for Electromaterials Science (ACES), University of Wollongong, NSW 2522, Australia #School of Mechanical, Materials and Mechatronics Engineering, University of Wollongong, Wollongong, NSW 2522, Australia ARC Centre of Excellence for Electromaterials Science, Intelligent Polymer Research Institute/AIIM Faculty, Innovation Campus, University of Wollongong, Squires Way, NSW, Australia *Corresponding Author Dr. Dipankar Mandal dipankar@phys.jdvu.ac.in;dpkrmandal@gmail.com Fax: Tel.: S-1

2 Table S1. Vibrational bands assignment of PLLA nanofibers based on FT-IR spectra Number Wavenumber (cm -1 ) Vibrational bands ν(c=o) as (CH 3 ) s (CH 3 ) (CH) ν(c H) ν(c H)+ ν(c O C) ν as (C O C)+r as (CH 3 ) ν as (C O C) r s (CH 3 ) ν s (C O C) ν s (C CH 3 ) S-2

3 He igh t (n m) Distance (µm) Figure S1. Height profile of AFM topographical image. Table S2. Comparison of PBio-e-skin with the previously reported sensors Transduction Active materials Maximum Lower Limit of Pressure Reference mechanisms sensitivity detection range Capacitance PDMS/SWCNTs 2.3ⅹ10 4 ~50 Pa < 1 MPa [1] kpa 1 Capacitance Ecoflex 1.62 kpa kpa [2] Capacitance PDMS/SWCNTs 1.5 kpa Pa < 1 kpa [3] Capacitance/OF PDMS 0.55 kpa 1 3 Pa 0.2 kpa [4] ET Capacitance/OF PDPP3T 192 kpa 1 < 0.3 Pa 5 kpa [5] ET OFET/Piezoresi Ge/Si NWs 11.5 kpa 1 15 kpa [6] stivity Piezoresistivity rgo foam 15.2 kpa Pa 49 kpa [7] Piezoresistivity PPy kpa Pa 20 kpa [8] Piezoresistivity PDMS 1.8 kpa Pa 1.2 kpa [9] Piezoresistivity PDMS/PtNWs 1.5 kpa 1 3 Pa 1.5 kpa [10] Piezoresistivity SBS elastomer 10.7 MHz 13.3 Pa 13 kpa [11] kpa 1 S-3

4 Piezoresistivity/ Triboelectricity AgNWs/PDMS/ CNT-PDMS kpa Pa 4.5 kpa [12] Triboelectricity PDMS/Ag NWs 0.31 kpa Pa 10 kpa [13] Triboelectricity micropyramid structures PDMS film 0.29 VkPa kpa [14] ZnOnanorod 2.1 μs kpa kpa 31.5 kpa [15] P(VDF-TrFE) nanofiber 1.1 V kpa Pa 2 kpa [16] P(VDF-TrFE) 0.75 mv kpa 1 40 kpa [17] P(VDF-TrFE) nanowires P(VDF-TrFE) microfiber array P(VDF TrFE)/BaTiO 3 nanocomposite micropillars P(VDF-TrFE)/ BrTiO 3 -FET P(VDF mV/N 0.1 N [18] mv/n 4 N [19] mv/n 5 N [20] MPa [21] V/Pa 20 Pa [22] TrFE)/BrTiO 3 microstructured FET P(VDF-TrFE)/ PbTiO 3 -FET MPa ---- [23] PVDF 1 kpa [24] Ferroelectret Cellular PP/α- 0.1 V kpa 1 2 Pa 1 MPa [25] TFT Si:H Piezoelectret PDMS/PTFE 10 V kpa 1 50 kpa [26] Piezoelectret PTFE/porous PTFE 1.5 V kpa 1 15 kpa [27] PLLA V/Pa 18 Pa 0.3 MPa This work nanofibers (22 V/N) S-4

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