Interfacing Transition Metal Dichalcogenides with Carbon Nanodots for Managing Photoinduced Energy and Charge-Transfer Processes

Vallan, L. ; Canton-Vitoria, R. ; Gobeze, H.B. ; Jang, Y. ; Arenal, R. (Universidad de Zaragoza) ; Benito, A.M. ; Maser, W.K. ; D''Souza, F. ; Tagmatarchis, N.

Resumen: Exfoliated semiconducting MoS2 and WS2 were covalently functionalized with 1, 2-dithiolane-modified carbon nanodots (CNDs). The newly synthesized CND-MoS2 and CND-WS2 hybrids were characterized by spectroscopic, thermal, and electron microscopy imaging methods. Based on electronic absorption and fluorescence emission spectroscopy, modulation of the optoelectronic properties of TMDs by interfacing with CNDs was accomplished. Electrochemical studies revealed facile oxidation of MoS2 over WS2 in the examined hybrids, suggesting it to be better electron donor. Excited state events, investigated by femtosecond transient absorption spectroscopic studies, revealed ultrafast energy transfer from photoexcited CNDs to both MoS2 and WS2. Interestingly, upon MoS2 photoexcitation, charge transfer from an exciton dissociation path of MoS2 to CNDs, within CND-MoS2, was observed. However, such a process in CND-WS2 was found to be absent due to energetic reasons. The present study highlights the importance of TMD-derived donor-acceptor hybrids in light energy harvesting and optoelectronic applications. Furthermore, the fundamental information obtained from the current results will benefit design strategies and impact the additional TMD-based hybrid materials to efficiently manage and perform in electron-transfer processes. development of additional TMD-based hybrid materials to efficiently manage and perform in electron-transfer processes.

Idioma: Inglés

DOI: 10.1021/jacs.8b09204

Año: 2018

Publicado en: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 140, 41 (2018), 13488-13496
ISSN: 0002-7863

Factor impacto JCR: 14.695 (2018)

Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 12 / 172 = 0.07 (2018) - Q1 - T1

Factor impacto SCIMAGO: 7.468 - Biochemistry (Q1) - Colloid and Surface Chemistry (Q1) - Chemistry (miscellaneous) (Q1) - Catalysis (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/T03-17R
Financiación: info:eu-repo/grantAgreement/EC/H2020/642742/EU/Graphene-based nanomaterials for touchscreen technologies: Comprehension, Commerce and Communication/Enabling Excellence
Financiación: info:eu-repo/grantAgreement/EC/H2020/785219/EU/Graphene Flagship Core Project 2/GrapheneCore2
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/ENE2016-79282-C5-1-R
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2016-79776-P

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)