title: Measuring and Predicting the Internal Structure of Semiconductor Nanocrystals through Raman Spectroscopy.
abstract: Nanocrystals composed of mixed chemical domains have diverse properties that are driving their integration in next-generation electronics, light sources, and biosensors. However, the precise spatial distribution of elements within these particles is difficult to measure and control, yet profoundly impacts their quality and performance. Here we synthesized a unique series of 42 different quantum dot nanocrystals, composed of two chemical domains (CdS:CdSe), arranged in 7 alloy and (core)shell structural classes. Chemometric analyses of far-field Raman spectra accurately classified their internal structures from their vibrational signatures. These classifications provide direct insight into the elemental arrangement of the alloy as well as an independent prediction of fluorescence quantum yield. This nondestructive, rapid approach can be broadly applied to greatly enhance our capacity to measure, predict and monitor multicomponent nanomaterials for precise tuning of their structures and properties.
authors.affiliation: Department of Bioengineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.|Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.
authors.forename: Prabuddha
authors.initials: P
authors.lastname: Mukherjee
authors.affiliation: Department of Bioengineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.|Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.
authors.forename: Sung Jun
authors.initials: SJ
authors.lastname: Lim
authors.affiliation: Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.
authors.forename: Tomasz P
authors.initials: TP
authors.lastname: Wrobel
authors.affiliation: Department of Bioengineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.|Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.|Departments of Chemical & Biomolecular Engineering, Electrical & Computer Engineering, Mechanical Science & Engineering and Chemistry, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.
authors.forename: Rohit
authors.initials: R
authors.lastname: Bhargava
authors.affiliation: Department of Bioengineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.|Micro and Nanotechnology Laboratory, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.|Department of Materials Science & Engineering, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States.
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Smith
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry; D004583:Electrons; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry*; D055620:Optical Phenomena; D045663:Quantum Dots / Q000737:chemistry*; D018036:Selenium Compounds / Q000737:chemistry; D012666:Semiconductors; D013059:Spectrum Analysis, Raman; D013440:Sulfides / Q000737:chemistry
chemical_list: D019187:Cadmium Compounds; D018036:Selenium Compounds; D013440:Sulfides; C034939:cadmium sulfide; C058667:cadmium selenide