Biomaterials and Living Systems

The convergence of biology and electronics is one of the more unusual frontiers in sustainable technology. Biomaterials and living systems offer routes to reducing the environmental burden of electronics that conventional materials engineering cannot easily match: substrates that decompose instead of persisting, organisms that recover metals from discarded circuit boards at ambient temperature and pressure, and, in a growing set of laboratory demonstrations, living cells that serve as functional electronic elements in their own right.

The scale of the waste problem gives this work its urgency. The Global E-waste Monitor 2024, published by the United Nations Institute for Training and Research and the International Telecommunication Union, reports that the world generated 62 million metric tons of electronic waste in 2022 and documented the formal collection and recycling of only 22.3 percent of it, leaving roughly 62 billion United States dollars in recoverable natural resources unaccounted for. Conventional recovery depends on smelting and aggressive hydrometallurgy, both energy intensive and both hazardous when practiced informally. Biological routes promise gentler chemistry at lower temperatures, although, as the sections below make clear, most of them remain at laboratory or pilot scale.

The field draws on materials science, synthetic biology, ecology, and public health in roughly equal measure. Its practitioners aim to design electronics that fit inside ecological cycles rather than accumulating outside them: products that limit harm to biodiversity during extraction and use, that return their materials to circulation at end of life, and that account for the health of workers, communities, and wildlife together.

Articles in This Category

The four topics below move outward in scale, from the materials and organisms inside a device to the ecological and public health systems that surround it.

Living Material Electronics - Examine electronics that incorporate living organisms or biologically derived materials as functional components. Topics include mycelium substrates grown from fungi, bacterial circuits and conductive biofilms, algae-based systems, plant-based sensors, metabolic powering through microbial fuel cells, self-healing biomaterials, growth-based assembly, biological computation, bioprinting, tissue engineering and organ-on-chip devices, and the synthetic biology tools that make engineered living materials possible.
Biodiversity and Electronics - Trace the relationships between electronics manufacturing, use, and disposal and the health of wild populations. Topics include habitat fragmentation from mining for electronic materials, electromagnetic effects on wildlife, light and noise pollution from illuminated and powered infrastructure, bird collision prevention, pollinator and marine life protection, impacts on forest, grassland, and urban ecosystems, wildlife corridors and green infrastructure, conservation technology and monitoring systems, the regulatory frameworks that apply, and design practices that reduce harm to species across the product lifecycle.
Bioremediation of Electronic Waste - Consider how biological processes recover valuable materials and neutralize hazardous substances in electronic waste. Topics include microbial leaching of metals from circuit boards, fungal remediation, phytoremediation of contaminated sites, bioaugmentation and biostimulation, enzyme applications, biofilm reactors, constructed wetlands, algae treatment systems, vermiremediation and composting, natural attenuation, genetically engineered organisms for targeted recovery, field applications, and the integration of bioremediation into circular economy strategies.
One Health Approach - Apply the One Health framework, which treats human, animal, and environmental health as one interconnected system, to electronics sustainability. Topics include the health burden of informal e-waste recycling on workers and nearby communities, zoonotic and vector-borne disease risks, antimicrobial resistance linked to manufacturing discharge, chemical exposure pathways through water, air, and food, environmental health indicators and wildlife health monitoring, surveillance systems, risk communication, and the policy and collaborative frameworks that connect these domains.

The Promise of Bio-Electronic Integration

Conventional electronics depend on mined minerals, petroleum-derived polymers, and high-temperature processing. Furnace steps in wafer fabrication routinely exceed 1,000 degrees Celsius, and refining metals from ore is comparably energy intensive. Living systems carry out sophisticated chemistry and charge transfer at ambient temperature and pressure using abundant inputs, and several of those capabilities map directly onto tasks that electronics engineers care about.

Extracellular electron transfer: Exoelectrogenic bacteria in the genera Geobacter and Shewanella pass respiratory electrons to surfaces outside the cell, which is what allows a microbial fuel cell to draw current from organic matter. Researchers originally attributed the conductive filaments of Geobacter to type IV pili. Cryogenic electron microscopy has since shown that the filaments are polymerized cytochromes, chiefly OmcS and OmcZ, whose closely stacked heme groups form a continuous conduction path, and OmcZ filaments have been measured at conductivities above 30 millisiemens per centimeter, roughly a thousand times those of OmcS filaments.
Power from waste streams: Microbial fuel cells oxidize organic matter in wastewater and deliver electrical current directly, treating the water and generating power in the same step. Output remains modest. Optimized laboratory cells reach roughly a few hundred to a couple of thousand milliwatts per square meter of electrode area, orders of magnitude below conventional generation, so the credible near-term applications are low-power remote sensing, buried and submerged instrumentation, and treatment processes that value organic removal as much as electricity.
Ambient-temperature metal recovery: Acidophilic iron- and sulfur-oxidizing bacteria mobilize copper from sulfide minerals, a process used commercially in heap and dump bioleaching of low-grade ore, and related organisms are used industrially to oxidize the sulfide matrix of refractory gold ores before conventional extraction. Cyanogenic bacteria such as Chromobacterium violaceum, which excrete cyanide as a metabolite, dissolve gold directly, but that route remains a laboratory technique. Applying either approach to shredded circuit boards is harder than applying it to ore and remains at laboratory and pilot scale, limited by slow kinetics, low solids loadings, and the toxicity of dissolved metals to the organisms doing the work.
Grown substrates: A 2022 demonstration built flexible circuit substrates from the skin that forms over a growing fungal mycelium. Metal conductors deposited on the skins survived more than 2,000 bending cycles, and the material supported working battery and Bluetooth sensor prototypes while remaining biodegradable at end of life.
Selective sensing: Biosensors built on enzymes, antibodies, or whole cells recognize specific molecules with a selectivity that purely physical transducers struggle to match, which suits them to environmental monitoring for pollutants, pathogens, and metals at low concentrations.

Taken together, these mechanisms mark a change in posture. Rather than overpowering natural processes with heat and reagents, the designer recruits them.

Bio-Derived and Biodegradable Materials

Not every biomaterial is alive. Much of the practical work in this area uses passive materials of biological origin, which sidestep the containment and stability problems of metabolically active systems while still displacing petrochemical inputs.

Cellulose: Nanocellulose paper and regenerated cellulose films serve as flexible, optically clear substrates with low coefficients of thermal expansion. They are compostable and draw on an abundant feedstock, but they absorb moisture readily and need barrier coatings in humid service.
Silk fibroin: Processing controls the crystallinity of silk films, and crystallinity controls how quickly they dissolve in water. That tunability underpins transient electronics, devices designed to disappear on a schedule, which draw interest for implantable and field-deployed sensors.
Bio-based polymers: Polylactic acid and the polyhydroxyalkanoates supply enclosures, films, and substrates. Their end-of-life behavior deserves care. Polylactic acid degrades at the elevated temperatures of industrial composting but persists for a long time in soil, seawater, and household compost, so describing it as biodegradable without naming the conditions overstates the case.
Mycelium composites: Fungal mycelium grown through agricultural residues forms rigid, low-density foams that are already sold as protective packaging, a direct substitute for expanded polystyrene in electronics shipping.
Natural resins and waxes: Shellac, beeswax, and gelatin work as dielectrics, encapsulants, and sacrificial layers in printed and transient devices.

The hard problem is not making a degradable material but reconciling degradation with service requirements. A substrate must first survive assembly, and lead-free reflow soldering peaks in the range of 240 to 250 degrees Celsius, well above the tolerance of most bio-derived polymers. That constraint pushes designers toward low-temperature assembly: conductive adhesives, printed silver or carbon traces, and press-fit connections in place of reflowed solder. A finished device must then resist moisture, heat, and ultraviolet light for its whole service life and degrade promptly afterward, a reversal that no material achieves by accident.

Bio-based origin is not by itself an environmental credential. Land use, fertilizer and water demand, processing energy, and the availability of suitable end-of-life infrastructure all shape the result, which is why claims in this area belong in a quantified product lifecycle assessment rather than in marketing copy. The same reasoning governs material selection and optimization more broadly.

Challenges and Considerations

Enthusiasm for these approaches runs ahead of their deployment, and the gap has specific causes.

Stability and reliability: Living components require water, nutrients, and a narrow temperature range, and their performance drifts as populations shift or become contaminated. Conventional electronics are expected to hold specification for years across wide temperature and humidity extremes. Closing that distance calls for dormancy strategies such as spores or freeze-dried cultures, and for tolerance to interruption that most laboratory systems have yet to demonstrate.
The performance gap: Biological elements sit orders of magnitude below semiconductors in power density and switching speed. Their credible role is complementary rather than substitutional: substrates, packaging, sensing, milliwatt-scale energy harvesting, and materials recovery, not logic or power conversion.
Scalability: Cultivation is slow, sensitive to contamination, and variable between batches, none of which sits comfortably beside the throughput and yield discipline of semiconductor manufacturing. Bioleaching in particular loses efficiency at the high solids loadings that would make an industrial process economic.
Biocontainment: Engineered organisms need physical containment and genetic safeguards alike, including auxotrophy for compounds absent from the environment, dependence on synthetic amino acids, and inducible kill switches. Escape risk must be assessed before any deployment outside a closed reactor, and outdoor bioremediation raises the question directly.
Regulatory gaps: Work here falls between electronics regimes such as the European Union's RoHS and WEEE directives and biotechnology oversight written for pharmaceuticals and agriculture. Neither anticipates an engineered organism embedded in a consumer product, and environmental marketing rules increasingly scrutinize unqualified degradability claims. Broader regulatory frameworks and standards set the surrounding context.
Measurement and honest claims: No widely accepted test method covers the degradation of a complete electronic assembly. Compostability standards were written for packaging and homogeneous plastics, not for multilayer boards carrying metals, solder, and semiconductor dies, so a board built on a compostable substrate is not itself compostable. Precision in claims matters here as much as precision in engineering.
Public acceptance: Consumer comfort with products containing engineered or living organisms depends on plain description of what the organism does, how it is contained, and what happens to it at disposal.

Interdisciplinary Collaboration

Progress in this area depends on collaboration across fields that rarely share a vocabulary. Electrical engineers work with microbiologists, materials scientists with ecologists, and product designers with public health specialists. The combination matters because a technically elegant solution can still fail an ecological or occupational test, and that failure usually surfaces only when someone outside the originating discipline asks the question.

The four topics in this section reflect that breadth, spanning the molecular scale of living material electronics, the ecosystem scale of biodiversity, and the population scale of the One Health approach. Read alongside circular economy implementation and electronic waste management, they outline a route toward electronics whose materials and byproducts re-enter biological and industrial cycles rather than accumulating at their margins.