EXPRESSION OF CONCERN : Tribological Behavior of Graphite Oxide Reinforced Polyethersulfone Composite under Drying Sliding Condition

EXPRESSION OF CONCERN: S. Yan, Y. Yang, L. song, X. Qi, Y. Xue, and C. Duan, “ Tribological Behavior of Graphite Oxide Reinforced Polyethersulfone Composite under Drying Sliding Condition,” Polymer Composites 39, no. 7 (2018): 2320–2335, https://doi.org/10.1002/pc.24211. This Expression of Concern is for the above article, published online on 20 September 2016 in Wiley Online Library (wileyonlinelibrary.com), and has been issued by agreement between journal Executive Editor Sadhan C. Jana; Editor-in-Chief, Alessandro Pegoretti; Society of Plastics Engineers; and Wiley Periodicals LLC. A third party shared a report from the National Natural Science Foundation of China which indicated that authors of this article had misused some images. An investigation by the publisher found that the images in Figures 15C and 15F appear to have derived from the same sample. Both sets of images are intended to show different experimental conditions. In addition, the investigation also found that the magnified inset panel in Figure 7C did not correspond to the larger SEM image. The authors did not respond to an inquiry and request for original data by the publisher, and therefore the data and conclusions in this article could not be validated. The journal has decided to issue an Expression of Concern to inform and alert the readers. The authors did not respond to our notice regarding the Expression of Concern.