Laser assisted direct write process with novel beam profiles

Shang, Shuo; Wellburn, Dan; Fearon, Eamonn; Yan, Shilian; Edwardson, Stuart; Dearden, G.; Watkins, Ken

doi:10.1016/j.optlaseng.2012.11.005

Cited by 12 publications

(5 citation statements)

References 26 publications

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“…94 Another solution to the problem of nonuniform temperature distribution could be to use beam-shaping or profiling. This technique has been successfully demonstrated in laser curing 95 and requires the inverse of the temperature distribution as an input in the beam profiler. A few examples are flat-top laser beams or donut shaped intensity profiles.…”

Section: Thermal Energymentioning

confidence: 99%

Laser-assisted growth of carbon nanotubes—A review

Burgt

2014

Journal of Laser Applications

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Laser-assisted chemical vapor deposition (LACVD) is an attractive maskless process for growing locally carbon nanotubes at selected places on substrates that may contain temperature-sensitive components. This review gives a comprehensive overview of the reported research with respect to laser assisted CVD for the growth of carbon nanotubes. The advantages and disadvantages of local growth using laser sources are discussed, with a focus on structural quality and properties, such as length, position and alignment, and process control. The paper is divided into two parts. The first part deals with the influence that the main parameters for nanotube growth-gas, catalyst and thermal energyhave on the growth of carbon nanotubes by laser-assisted synthesis. The second part deals with the attempts and successes to control different aspects of local nanotube growth using a laser-assisted growth method. V

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Section: Thermal Energymentioning

confidence: 99%

Laser-assisted growth of carbon nanotubes—A review

Burgt

2014

Journal of Laser Applications

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“…The experiment generally starts with the deposition of the ink track onto a polymer substrate using a doctor blade technique [4]. The ink track samples were then transferred onto the modified stereo lithography apparatus for curing before hardness and resistivity measurements are carried out.…”

Section: Methodsmentioning

confidence: 99%

“…These processes use heat to evaporate binders and unwanted solvent in conductive ink polymers leaving only the metallic content on the substrate that is already been hardened and sticks onto the substrate. The conventional curing methods have their own weaknesses which laser irradiation process is a costly process [4] and silver conductive ink cured with conventional oven might undergo a warping defect [5]. Thus, there is a need to explore the possibility of using DLP projector as it was proven before that DLP projector had succesfully polymerised a photopolymer materials [6].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of DLP Projector as an Energy Light Source to Cure Silver Conductive Ink

Khirotdin

Nasir

Kamarudin

et al. 2015

AMM

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Abstract. Conductive ink has been widely used in many application of electronic parts. It normally comes in liquid form and will need to be cured usually by conventional oven or laser irradiation after it is drawn to expose its metallic contents. But, these curing processes suffer from numerous problems consist of laser is a costly process and a warping defect when cured using conventional oven. Thus, alternative process is prominent and DLP projector has been seen capable of polymerised photopolymer materials. By making use of its potential associated with a proper control of the light intensity, exposure time and distance, it could provides sufficent heat to cure conductive ink. This study investigates the curing process of silver conductive ink on polymer substrate using DLP projector light with a variation of curing time and distance. Electrical resistance, hardness and adhesion level of cured sample were measured to determine its functionality. The conductive ink is deposited on the substrate using doctor blade method and Microsoft Powerpoint slide is used to shape the light image produced by the projector. It was found that the conductivity and curing level of the sample cured were higher at the distance which getting the sharpest light image. The performances of the samples were also greater as the curing time increased. DLP projector is able to cure the conductive track efficiently with shorter curing time apart from the cheap preparation and setup cost.

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“…Improvements have been made in the fields of laser hardening and ink curing by using triangular beams [39], rings filled with a low intensity plateaus [40,41] or lines with and M-shaped irradiance profiles [35]. These findings were made by iterative variation of profiles in models and/or experiments until the desired temperature profiles were achieved.…”

Section: Introductionmentioning

confidence: 99%

An inverse model for optimisation of laser heat flux distributions in an automated laser tape placement process for carbon-fibre/PEEK

Stokes-Griffin

Compston

2016

Composites Part A: Applied Science and Manufacturing

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a b s t r a c tHigh power diode lasers have enabled higher placement rates to be achieved in automated tape placement (ATP) of thermoplastic-based composite materials. Laser ATP heads in published literature employ homogeneous linear or rectangular laser spots, however a variety of solutions are available to produce customised irradiance profiles. No efforts to date have investigated what a more ideal heat flux profile would be for laser ATP in terms of length and distribution. This paper describes a method to determine the required laser heat flux profiles to achieve desired heating zone temperature profiles by means of an inverse thermal model. A bonding model was implemented to assess the performance of various heating zone temperature profiles for placement at 400 mm/s. Short beam strengths from experimental trials were used to validate the bonding model. A two-stepped heating profile was found to provide a good balance of increased strength with a small increase in power requirement.

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Laser assisted direct write process with novel beam profiles

Cited by 12 publications

References 26 publications

Laser-assisted growth of carbon nanotubes—A review

Laser-assisted growth of carbon nanotubes—A review

Investigation of DLP Projector as an Energy Light Source to Cure Silver Conductive Ink

An inverse model for optimisation of laser heat flux distributions in an automated laser tape placement process for carbon-fibre/PEEK

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