The tremendous variety of nanotechnology experiments and tools to fabricate and characterize ever-smaller structures down to molecular or even atomic scales leads to stringent demands for appropriate, so-called “silent”, premises that allow such susceptible experiments to be conducted. Reducing dimensions means smaller absolute optical and electrical signal levels, and consequently reduced signal-to-noise ratios. Hence, in addition to short-range disturbances inside the laboratory, remote long-range noise sources have to be considered for next-generation laboratories that aim at screening the disturbances and keeping the remaining values at utmost constancy. We present a novel laboratory concept that addresses simultaneously all the disturbances relevant for nanotechnology, namely, vibrations, electro-magnetic fields, temperature, humidity, and sound. Particular attention was paid to tackling the mutual derogation of the various measures to enable unprecedented performance of the novel research platform.
28 May 2021 in Angewandte Chemie International Edition
Nanopatterned surfaces enhance incident electromagnetic radiation and thereby enable the detection and characterization of self‐assembled monolayers (SAMs), for instance in surface‐enhanced Raman spectroscopy (SERS). Herein, Au nanohole arrays, developed and characterized as SERS substrates, are exemplarily used for monitoring a solid‐phase deprotection and a subsequent copper(I)‐catalyzed azide–alkyne cycloaddition “click” reaction, performed directly on the corresponding SAMs. The SERS substrate was found to be highly reliable in terms of signal reproducibility and chemical stability. Furthermore, the intermediates and the product of the solid‐phase synthesis were identified by SERS. The spectra of the immobilized compounds showed minor differences compared to spectra of the microcrystalline solids. With its uniform SERS signals and the high chemical stability, the platform paves the way for monitoring molecular manipulations in surface functionalization applications.