2000001 (1 of 14) © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim www.advmattechnol.de FULL PAPER Multifunctional Nanomaterials Modifcation of Cellulose Paper for Efcient Triboelectric Nanogenerators Saichon Sriphan, Thitirat Charoonsuk, Tosapol Maluangnont, Phakkhananan Pakawanit, Catleya Rojviriya, and Naratip Vittayakorn* DOI: 10.1002/admt.202000001 There is a need to develop inexpensive, lightweight, and fexible high- performance triboelectric nanogenerators (TENGs) from renewable resources. Here, a multifunctional cellulose flter paper (CFP)-based TENG consisting of dielectric Ti 0.8 O 2 nanosheets (Ti 0.8 O 2 NSs) and conducting Ag nanoparticles (Ag NPs) is prepared by a simple dip coating method. The incorporation of dielectric Ti 0.8 O 2 NSs onto the CFP signifcantly improves charge generation, while the inclusion of Ag NPs provides an electrically conductive path for charge transportation. The presence of these fllers can be deduced from XRD, SEM, EDS, X-ray photoelectron spectroscopy, and Raman spectroscopy. Their distribution is visualized in 3D by synchrotron radiation X-ray tomography. The present CFP-based TENG provides an output voltage and current density of ≈42 V and ≈1 μA cm -2 , respectively with the power density of ≈25 μW cm -2 . It is capable of lighting up 40 light- emitting diode bulbs and charging a 0.22 μF capacitor to 8 V in only 5 s. The developed TENG is also capable of detecting simple human motions, i.e., fnger tapping, fnger rubbing, and foot trampling. This work ofers a facile design of low cost yet efcient paper-based TENG by dual modifca- tion with multifunctional nanomaterials, and also demonstrates its use as a feasible power source that not only drives small electronics, but also scavenges energy from human actions. Dr. S. Sriphan Faculty of Science, Energy and Environment King Mongkut’s University of Technology North Bangkok Rayong Campus, Rayong 21120, Thailand Dr. S. Sriphan, Prof. N. Vittayakorn Advanced Material Research Unit Faculty of Science King Mongkut’s Institute of Technology Ladkrabang Bangkok 10520, Thailand E-mail: naratip.vi@kmitl.ac.th Dr. T. Charoonsuk Department of Materials Science Faculty of Science Srinakharinwirot University 114 Sukhumvit 23, Watthana, Bangkok 10110, Thailand The ORCID identifcation number(s) for the author(s) of this article can be found under https://doi.org/10.1002/admt.202000001. Prof. T. Maluangnont Electroceramics Research Laboratory College of Nanotechnology King Mongkut’s Institute of Technology Ladkrabang Bangkok 10520, Thailand Dr. P. Pakawanit, Dr. C. Rojviriya Synchrotron Light Research Institute (Public Organization) 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand Prof. N. Vittayakorn Department of Chemistry Faculty of Science King Mongkut’s Institute of Technology Ladkrabang Bangkok 10520, Thailand supply. [1,2] Among various kinds of mechanical energy harvesters (MEHs), triboelectric nanogenerators (TENGs) [2b,3] have received an increasing amount of attention. TENGs are efective devices for sensing of (and also for harvesting from) human activities such as motion, [4] vibration, [5] and sound, [6] thereby being self-powering. [7] It is highly desirable that a thin, lightweight, and fexible TENGs [8] can be facilely fabricated by an environmentally friendly and inexpen- sive method, preferably onto a substrate derived from renewable resource. [9–11] Cellulose is one of the materials of choice for environmentally friendly, self- powered TENGs [12] thanks to its abun- dance, low cost, biodegradability, high strength, and diverse chemistries for sur- face modifcations. Three types of “cel- lulose” are currently being investigated including i) cellulose nanofbrils (CNFs) and bacterial cellulose (BC), ii) function- alized CNFs, and iii) CNFs-composites. The CNFs and BC typically exhibit low triboelectric output performance, because their pristine surfaces possess only limited capability of charge generation. [9a,13–16] Meanwhile, higher output performance could be achieved over functional- ized CNFs with surface groups introduced via chemical reac- tions, which are often complicated and not environmentally 1. Introduction The transformation of mechanical energy to clean elec- tricity is an alternative for sustainable and continuous power Adv. Mater. Technol. 2020, 2000001