Recent Developments in Smartphone Spectrometer Sample Analysis

Biswas, Pranab Kumar; Rani, Saptami; Hossain, Arafat; Canning, John

doi:10.1109/jstqe.2021.3075074

Cited by 25 publications

(11 citation statements)

References 74 publications

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“…The absorbance at other color channels (A G and A B ) were also determined in a similar way and plotted in Figure 5b. The results show the strongest absorption at the blue channel and weakest absorption at red channel in EVO oils compared to other channels that satisfy the absorption spectrum measured using standard benchtop instruments in our previous work [39]. This assumes that the amount of red fluorescence that may occur with blue absorption is comparatively small.…”

Section: Absorption Based Sensing Of Olive Oil Using 3d-printed Fibersupporting

confidence: 76%

“…One area that can benefit tremendously from 3D-printed low-cost customized elements is various field-portable analytics or diagnostics, including wearables and biosensor-edge devices in the IoT, in which customized, flexible, user friendly operation with enhanced detection capabilities, high throughputs and improve signal-to-noise ratio are required [ 36 , 37 , 38 ]. An area of recent interest is the integration with smartphone technologies to enhance their sensing capabilities [ 39 , 40 ]. Currently, 3D-printed enclosures are used in most of the smartphone-based biomedical instruments to keep the hardware components in their fixed position and block stray light illumination [ 41 , 42 , 43 ].…”

Section: Introductionmentioning

confidence: 99%

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Low-Cost 3D Printer Drawn Optical Microfibers for Smartphone Colorimetric Detection

et al. 2022

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A fused deposition modeling (FDM) 3D printer extruder was utilized as a micro-furnace draw tower for the direct fabrication of low-cost optical fibers. An air-clad multimode microfiber was drawn from optically transparent polyethylene terephthalate glycol (PETG) filament. A custom-made spooling collection allows for an automatic variation of fiber diameter between ϕ ∼ 72 to 397 μm by tuning the drawing speed. Microstructure imaging as well as the 3D beam profiling of the transmitted beam in the orthogonal axes was used to show good quality, functioning microfiber fabrication with uniform diameter and identical beam profiles for orthogonal axes. The drawn microfiber was used to demonstrate budget smartphone colorimetric-based absorption measurement to detect the degree of adulteration of olive oils with soybean oil.

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Section: Absorption Based Sensing Of Olive Oil Using 3d-printed Fibersupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Low-Cost 3D Printer Drawn Optical Microfibers for Smartphone Colorimetric Detection

et al. 2022

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“…With the selected sensor, the key technology component becomes the choice of portable and remote operating diagnostic. To recognise further the potential of this approach, this work focuses on using a widely available consumer product, the smartphone [15,16], which can allow general community access to diagnostics. This simply recognises that practical environmental monitoring requires as much social and community engagement as technology and insight, and so a future is envisaged that develops accessible natural and "green" technology to foster such engagement.…”

Section: Introductionmentioning

confidence: 99%

Towards a bionic IoT: Environmental monitoring using smartphone interrogated plant sensors

Guo

Canning²,

Chaczko³

2023

PLoS ONE

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The utilisation of plants directly as quantifiable natural sensors is proposed. A case study measuring surface wettability of Aucuba japonica, or Japanese Laurel, plants using a novel smartphone field interrogator is demonstrated. This plant has been naturalised globally from Asia. Top-down contact angle measurements map wettability on-site and characterise a range of properties impacting plant health, such as aging, solar and UV exposure, and pollution. Leaves at an early age or in the shadow of trees are found to be hydrophobic with contact angle θ ~ 99°, while more mature leaves under sunlight are hydrophilic with θ ~ 79°. Direct UVA irradiation at λ = 365 nm is shown to accelerate aging, changing contact angle of one leaf from slightly hydrophobic at θ ~ 91° to be hydrophilic with θ ~ 87° after 30 min. Leaves growing beside a road with heavy traffic are observed to be substantially hydrophilic, as low as θ ~ 47°, arising from increased wettability with particulate accumulation on the leaf surface. Away from the road, the contact angle increases as high as θ ~ 96°. The results demonstrate that contact angle measurements using a portable diagnostic IoT edge device can be taken into the field for environmental detection, pollution assessment and more. Using an Internet connected smartphone combined with a plant sensor allows multiple measurements at multiple locations together in real-time, potentially enabling tracking of parameter change anywhere where plants are present or introduced. This hybrid integration of widely distributed living organic systems with the Internet marks the beginning of a new bionic Internet-of-things (b-IoT).

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“…Among the device features, complementary metal-oxide-semiconductor (CMOS) image sensors on smartphones can convert optical signals into electrical signals [ 31 ]. With the continuous advancements in their integrated circuit design and manufacturing technology, smartphone cameras are increasingly improving sensitivity, resolution, and dynamic range with reduced power consumption [ 32 , 33 ]. These cameras have even been applied to smart cars, which are more demanding than smartphones [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

A Real-Time Detection Method of Hg2+ in Drinking Water via Portable Biosensor: Using a Smartphone as a Low-Cost Micro-Spectrometer to Read the Colorimetric Signals

Jiao

Cao

et al. 2022

Biosensors

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This paper reported a real-time detection strategy for Hg2+ inspired by the visible spectrophotometer that used a smartphone as a low-cost micro-spectrometer. In combination with the smartphone’s camera and optical accessories, the phone’s built-in software can process the received light band image and then read out the spectral data in real time. The sensor was also used to detect gold nanoparticles with an LOD of 0.14 μM, which are widely used in colorimetric biosensors. Ultimately, a gold nanoparticles-glutathione (AuNPs-GSH) conjugate was used as a probe to detect Hg2+ in water with an LOD of 1.2 nM and was applied successfully to natural mineral water, pure water, tap water, and river water samples.

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Recent Developments in Smartphone Spectrometer Sample Analysis

Cited by 25 publications

References 74 publications

Low-Cost 3D Printer Drawn Optical Microfibers for Smartphone Colorimetric Detection

Low-Cost 3D Printer Drawn Optical Microfibers for Smartphone Colorimetric Detection

Towards a bionic IoT: Environmental monitoring using smartphone interrogated plant sensors

A Real-Time Detection Method of Hg2+ in Drinking Water via Portable Biosensor: Using a Smartphone as a Low-Cost Micro-Spectrometer to Read the Colorimetric Signals

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