Amylin 20-29 (sequence SNNFGAILSS) and Aβ 25-35 (sequence GSNKGAIIGLM) were purchased from GL Biochem (Shanghai, China) at 91% purity and used without further purification. Dimethylsulfoxide (DMSO) was purchased at ≥99.8% purity from Supelco. Milli-Q grade water (18.2 MΩ cm) was obtained from a Milli-Q ® IQ 7000 Ultrapure Lab Water System from Millipore Sigma. Phosphate buffer saline tablets were purchased from Sigma Aldrich. Phosphate buffer solution was made from sodium phosphate monobasic monohydrate and sodium phosphate dibasic anhydrous purchased from Fisher Scientific. Filters (0.45 µm pore-size) were purchased from Fisher Scientific. Mica (Product No. 50, V1 Grade) and silicon substrates (Product No. 21610 -55) were purchased from Ted Pella Inc. An ultra-sharp commercial Atomic Force Microscopy (AFM) probe (160AC, OPUS by MikroMach) and a standard AFM probe (PPP-NCHR, Nanosensors™) were both purchased from NanoAndMore USA Corporation.