@article{Gong2026, 
author = {Fanghe Gong and Niuniu Zhang and Wenyu Zhang and Yanyan Song and Zihan Ying and Zhixing Gan and Dongdong Xu and Jianchun Bao and Xiangxing Xu},
title = {Synthesis of phase-pure monolayer 1T-MoS2 and 2H-MoS2 colloidal nanomaterials with negative photoconductivity},
year = {2026},
journal = {Nano Research},
keywords = {1T-MoS2, wet-chemical synthesis, negative photoconductivity, 2H-MoS2, colloidal nanomaterials},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94908847},
doi = {10.26599/NR.2026.94908847},
abstract = {MoS2 is an important two-dimensional transition metal dichalcogenide (TMD), whose physical and chemical properties are closely related to its layer number, size, defects, and crystal structure. Therefore, the controllable synthesis of phase-pure monolayer MoS2 represents a key challenge. Herein, we report a simple and efficient wet-chemical synthesis strategy for 1T-MoS2 and 2H-MoS2, with the crystal phase controlled by the reaction temperature. At 220 °C, ultra-small (1–2 nm) monolayer 1T-MoS2 colloids are obtained; at 250 °C, monolayer 2H-MoS2 nanosheets are produced. Both materials exhibit good dispersibility in nonpolar solvents and can be readily spin-coated into thin films. Interestingly, the 1T-MoS2 and 2H-MoS2 exhibit different exciton dynamics in transient absorption (TA) spectra, but similar trap state-induced negative photoconductivity (NPC) under near-infrared (825 nm) illumination. These findings provide new perspectives for the design of MoS2-based optoelectronic devices.}
}