Triboelectric Series of 2D Layered Materials

• Published in: Advanced materials (Weinheim) Vol. 30; no. 39; pp. e1801210 - n/a
• Main Authors: Seol, Minsu, Kim, Seongsu, Cho, Yeonchoo, Byun, Kyung‐Eun, Kim, Haeryong, Kim, Jihye, Kim, Sung Kyun, Kim, Sang‐Woo, Shin, Hyeon‐Jin, Park, Seongjun
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 26.09.2018
• Subjects: 2D materials; chemical doping; Chemical vapor deposition; effective work function; Electric power generation; Film thickness; Graphene; Layered materials; Materials science; Molybdenum disulfide; Nanogenerators; Organic chemistry; Polarity; Tribo charging; triboelectric nanogenerators; triboelectric series; Vapor deposited films; triboelectric nanogenerators; triboelectric series; effective work function; chemical doping; 2D materials
• ISSN: 0935-9648; 1521-4095; 1521-4095
• DOI: 10.1002/adma.201801210

Recently, as applications based on triboelectricity have expanded, understanding the triboelectric charging behavior of various materials has become essential. This study investigates the triboelectric charging behaviors of various 2D layered materials, including MoS2, MoSe2, WS2, WSe2, graphene, and graphene oxide in a triboelectric series using the concept of a triboelectric nanogenerator, and confirms the position of 2D materials in the triboelectric series. It is also demonstrated that the results are obviously related to the effective work functions. The charging polarity indicates the similar behavior regardless of the synthetic method and film thickness ranging from a few hundred nanometers (for chemically exfoliated and restacked films) to a few nanometers (for chemical vapor deposited films). Further, the triboelectric charging characteristics could be successfully modified via chemical doping. This study provides new insights to utilize 2D materials in triboelectric devices, allowing thin and flexible device fabrication. A triboelectric series of 2D layered materials is confirmed using the concept of a triboelectric nanogenerator. The position of 2D materials in the triboelectric series is obviously related to the output signal obtained from the triboelectric nanogenerator and the effective work function. These results provide new insights for realizing 2D‐materials‐based high‐performance energy harvesting and wearable devices.