Journal of Nanomaterials has retracted the article titled “Influence of L-Tryptophan on Growth and Optical Properties of PbS Nanocrystalline Thin Films” [1]. As originally raised on PubPeer [2], the article was found to have concerns with some of the figures. A summary of the concerns is as follows: (i)Figures 4(a), 4(c), and 4(e) (left-hand side) are identical to Figures 2(a), 2(b), and 2(c) in [3] despite [1] using tryptophan and [3] using lithium. A corrigendum has since been published to replace these figures in the other article [4].(ii)Figure 4(a), 4(c), and 4(e) (right-hand side) are identical to Figures 1(a), 1(b), and 1(c) in [5], despite [1] using tryptophan and [5] using bismuth.(iii)In Figure 14(a), the absorption spectra for PbS-T5 and PbS-T10 appear to be identical.(iv)In Figure 3, the PbS-T30 and PbST20 traces appear to be identical. The PbS spectrum (black) also appears to be identical with the PbS spectrum in [6].
The journal and the editorial board are retracting the article due to concerns that the data in this article are not reliable. The authors do not agree to retraction.