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The purpose of this study was to optimize a new synthesis technique, “DiaSynth,” to produce near-infrared (nIR) absorbing gold nanoplates with prescribed localized surface plasmon resonance (LSPR) wavelengths in higher yields over conventional synthesis methods without the need for laborious purification steps. The molecular weight cut off (MWCO; 3.5, 8, 12, 15, 25 & 50 kDa) of the regenerated cellulose membranes (RCM), temperature (25, 37, 50 & 100 °C) and surface area to volume (SA/Vol) ratio (220, 340 & 470 mm2 ml−1) of the RCM to the gold nanoplate solution were varied during the synthesis process to determine the effect of each parameter on gold nanoplates yield, LSPR peak placement and stability. Results indicate the ability of the RCM to remove ∼99% of the contaminant small gold colloid (<10 nm) produced during the synthesis process, while producing a 72% higher yield of gold nanoplates …