University Of Tasmania

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3D printed LED based on-capillary detector housing with integrated slit

journal contribution
posted on 2023-05-19, 03:18 authored by Cecil, F, Zhang, M, Rosanne Guijt, Alan HendersonAlan Henderson, Nesterenko, PN, Brett PaullBrett Paull, Michael BreadmoreMichael Breadmore, Miroslav MackaMiroslav Macka
A 3D printed photometric detector body with integrated slit was fabricated to position a LED and photodiode either side of capillary tubing using a fused deposition modelling (FDM) printer. To make this approach suitable for capillaries down to 50 μm i.d. the dimension of the in-built slit is the critical element of the printed housing. The spatial orientation of the model for printing was found to significantly impact on the resolution of the structures and voids that can be printed. By designing a housing with a slit positioned in the XY plane in parallel with the print direction, the narrowest void (slit) that could be printed was 70 μm. The potential use of the 3D printed slit for photometric detection was characterised using tubing and capillary from 500 down to 50 μm i.d, demonstrating a linear response from 632 to 40 mAU. The effective pathlength and stray light varied from 383 to 22 μm and 3.8% - 50% for 500- 50 μm i.d tubing and capillary. The use of a V-shaped alignment feature allowed for easy and reliable positioning of the tubing inside the detector, as demonstrated by a RSD of 1.9% (n = 10) in peak height when repositioning the tubing between measurements using flow injection analysis (FIA). The performance of the 3D printed housing and 70 μm slit was benchmarked against a commercially available interface using the CE separation of Zn2+ and Cu2+ complexes with PAR. The limit of detection with the 3D printed slit was 6.8 and 4.5 μM and is 2.8 and 1.6 μM with the commercial interface.


University of Tasmania


Publication title

Analytica Chimica Acta








School of Natural Sciences


Elsevier Science Bv

Place of publication

Po Box 211, Amsterdam, Netherlands, 1000 Ae

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© 2017 Elsevier B.V. All rights reserved.

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  • Restricted

Socio-economic Objectives

Measurement and assessment of marine water quality and condition