Internet of Paint (IoP): Design, Challenges, Applications and Future Directions

TL;DR

This work proposes the Internet of Paint (IoP), embedding nano-scale transceivers in paint to form a THz-enabled communication and sensing network within common coatings. It analyzes THz channel characteristics in the paint/plaster/air stack, showing five principal propagation paths and highlighting lateral waves along the Air-Paint interface as a viable, though challenging, communication route. Through simulations at $200-300$ GHz with a paint thickness of $2$ mm (n ≈ $2.13$), it demonstrates that paint-based channels suffer a two-order magnitude loss in capacity compared to air, yet capacity gains are achievable by strategic transceiver placement near interfaces and by topology design. The paper also reviews nano-materials (e.g., graphene, MWCNTs) and protective, paint-compatible materials for antennas, identifies critical challenges such as medium properties, power delivery, dense network requirements, noise, and signal coupling, and outlines future directions for integrating IoP into indoor, outdoor, and space environments. Overall, IoP has the potential to transform surfaces into pervasive communication and sensing hubs, enabling novel applications while presenting substantial material, fabrication, and system design challenges to overcome.

Abstract

The proliferation of nano-technology has enabled novel applications in various fields, including the potential for miniaturized terahertz (THz)-enabled devices. The extra-large bandwidth available in the THz spectrum can facilitate high-speed communication, even for transmission through lossy media. Culminating these capabilities, this paper introduces a new paradigm: Internet of Paint (IoP), transforming the 40,000-year-old concept of paint with extensive connectivity and sensing capabilities. IoP will enable seamless, massively parallel, and high-capacity communication and sensing capabilities, enabling innovative applications. IoP is expected to offer communication and sensing using nano-devices embedded in paint. In this paper, challenges towards the realization of IoP are discussed. Simulations indicate that THz signals in this stratified medium can form lateral waves that propagate along the Air-Paint interface and that relatively high channel capacity can be achieved by optimizing the transceiver locations, the paint thickness, and color. Addressing the challenges regarding nano-devices, nano-transceivers, materials, antennas, and power for IoP holds the potential to transform communication technologies and their seamless integration with living spaces.

Figures (4)

• Figure 1: Internet of Paint (IoP) and its futuristic applications.
• Figure 2: Illustration of device-to-device communication for nano-devices embedded in paint resulting in the direct path, reflected paths, and lateral waves that can propagate along the air-path and paint-plaster interfaces Thakshila_IoP_2024.
• Figure 3: Path loss variation with the burial depth for different LoS distances ($\rho_D=2$ and $4$ cm) for a fixed frequency ($200$ GHz) and thickness ($2$ mm) for Titanium white paint (n = $2.13$) (LW: Lateral Wave, RW: Reflected Wave, DW: Direct Wave, A-P: Air-Paint and P-P: Paint-Plaster Interface) Thakshila_IoP_2024.
• Figure 4: Comparison of Channel capacity through Air and Paint (Multipath) for various transceiver burial depths within $200$ to $300$ GHz frequency. The thickness is considered as $2$ mm for Titanium white paint (n = $2.13$) Thakshila_IoP_2024.