Study of novel electrical routing and integrated packaging on bio-compatible flexible substrates

Abstract

Electrical routing and integrated packaging on bio-compatible flexible substrates have been designed and fabricated. The realized packaging method can integrate electrical circuits, stationary components and moving components on flexible substrates. Chips can be embedded on flexible packages and work on a non-planar surface. In this article, the package specimens are tested and simulated in tensile, bending and sealing experiments. In addition, the density and Young's Modulus of polydimethylsiloxane (PDMS) is discussed with various curing conditions. A prototype made by the packaging process shows its functional system integration. This flexible packaging technology can be applied to communication or sensing products when flexibility is required.

Extended PDMS stiffness range for flexible systems

“…[0. [1][2][3][4] MPa [30], that would increase the applications spectrum of the material. As a consequence it remains very difficult to find a complete study where fabrication recipes and mechanical properties, over a large domain of applications, are brought together.…”

“…Much work has been done into the investigation of the mechanical properties of PDMS and their potential tunability [26,28,21,29,30,16,31,32,17,33,4,[34][35][36][37]. The largest observed tensile stiffness, using 10:1 PDMS, to date is less than 4 MPa [30] after 7 days post-baking at 100 • C and less than 3 MPa for post-baking at 200 • C during 18 min [37].…”

“…Although the first organosilicon was first synthesized over one hundred years ago [1], it is only in the last 20 years that polymeric organosilicon compounds -such as polydimethylsiloxane (PDMS) -have found applications in areas such as flexible electronics [2][3][4][5][6], moulding and soft lithography [7][8][9]11,[11][12][13][14], microelectromechanical systems (MEMS) [15][16][17], self-healing materials [18], laboratory-on-a-chip and microfluidics [19][20][21][22][23], photonics [24,25]. The physical and chemical properties of PDMS, such as its usability over a wide temperature range (T ∈[−100, 200] • C), its flexibility (Elastic modulus E ≈ 1 MPa [26]), its low chemical reactivity as well as its relatively hydrophilic behavior, its transparent nature, its biocompatibility [27], its low cost, etc.…”

Performance assessment of an opto-fluidic phantom mimicking porcine liver parenchyma

“…Further, the amplitude of the peak did not correlate to the changes in flow level. This peak could be varied by adjusting the mechanical properties of the fluidic system either by changing the curing method of the PDMS as described by Hong et al 30 or modifying the tubing (material or size) used in the system. Preliminary studies were conducted to verify this hypothesis, and the low-frequency peak was able to be shifted from 0.833 to 0.55 Hz at a constant perfusion level of 1 ml∕ min ∕g by using a more compliant phantom.…”

Stretchable Biofuel Cells with Silver Nanowiring on a Polydimethylsiloxane Substrate

“…Polydimethylsiloxane (PDMS) is a material that has been extensively investigated for use in many biodevices because it is biocompatible, flexible, and stretchable [26][27][28][29]. For example, Xu et al reported stretchable light emitting diodes with strain sensors, with AgNWs embedded in a PDMS substrate.…”