Full text not available from this repository.

Abstract

Ultraviolet (UV)-light-emitting diodes (LEDs) are now widely used in analytical absorbance-based detectors; as compared to conventional UV lamps, they offer lower cost, faster response time, and higher photon conversion efficiency. However, current generation deep-UV-LEDs produce excess heat when operated at normal operating currents, which affects output stability and reduces their overall performance and lifespan. Herein a 3D printed liquid cooling interface has been developed for a deep-UV-LED-based optical detector, for capillary format flow-through detection. The interface consists of a circular channel that is tightly wrapped around the LED to provide active liquid cooling. The design also facilitates easy plug-and-play assembly of the various essential components of the detector: specifically, a 255 nm UV-LED, a capillary Z-cell, and a broadband UV photodiode (PD). The unique liquid cooling interface improved the performance of the detector by reducing the LED temperature up to 22°C, increasing the spectral output up to 34%, decreasing the required stabilization time by up to 6-fold, and reducing the baseline noise and limits of detection (LODs) by a factor of 2. The detector was successfully used within a capillary HPLC system and could offer a miniaturized, rapidly stabilized, highly sensitive, and low-cost alternative to conventional UV detectors.

Item Type:	Article
Authors/Creators:	Lam, SC and Gupta, V and Haddad, PR and Paull, B
Keywords:	deep-UV-LED, liquid cooling, 3D printing, capillary LC, detector
Journal or Publication Title:	Analytical Chemistry
Publisher:	American Chemical Society
ISSN:	0003-2700
DOI / ID Number:	https://doi.org/10.1021/acs.analchem.9b01335
Copyright Information:	Copyright 2019 American Chemical Society
Related URLs:	Google Scholar: Gupta, V UTAS Profile: Gupta, V UTAS Profile: Haddad, PR Google Scholar: Paull, B UTAS Profile: Paull, B
Item Statistics:	View statistics for this item

Actions (login required)

Item Control Page