ACS Nano 'Under Review': What Each Status Means and When to Expect a Decision

Before the paper reaches external reviewers, an ACS Nano Associate Editor evaluates whether the nanoscience-significance warrants ACS Nano's selective editorial slots. Roughly 50 to 60 percent of submissions are rejected at this stage within a 4-day median for clearly out-of-scope work.

A desk rejection most often means the editors concluded that the work would fit better at a sister ACS journal (ACS Applied Materials & Interfaces for applied nanomaterials, ACS Applied Nano Materials for nanomaterials specialty, Nano Letters for shorter-format nanoscience) or that the experimental validation bar is not met. Computational nanostructure papers without experimental validation get rejected at desk.

From upload to decision, an ACS Nano manuscript moves through these stages:

• Day 0 to 2, administrative processing: The ACS Nano editorial office confirms files are complete: manuscript with figures embedded, Supporting Information with characterization data (TEM, SEM, XRD, XPS, spectroscopy), reporting checklists where applicable (ARRIVE for animal nanomedicine work, MIQE for quantitative PCR), cover letter directed to the Associate Editor, conflict-of-interest declarations, ethics-statement documentation, and data-availability statement.
• Days 2 to 7, Associate Editor desk screen (4-day median for clear rejections): The Associate Editor reads the paper and evaluates nanoscience-significance, experimental validation adequacy, characterization data, and ACS Nano subspecialty routing.
• Days 3 to 7, EIC consultation (parallel for ambiguous cases): In parallel with the primary Associate Editor's read, ambiguous-fit papers may be discussed with the Editor-in-Chief or peer Associate Editors. This consultation runs alongside the primary read and adds 2 to 4 days to the timeline that is invisible to the author in the portal.
• Days 7 to 21, external reviewer recruitment: ACS Nano Associate Editors typically invite 2 to 3 external reviewers, with reviewer recruitment typically taking 7 to 14 days. The recruitment window can take longer because reviewers with topic-matched nanoscience subspecialty expertise are scarce.
• Days 10 to 49, active peer review: Once reviewers agree to review, the typical ACS Nano peer-review cycle lasts 2 to 5 weeks per reviewer, contributing to the 1.1-month first review round median. Reviewers are asked to evaluate nanoscience-significance, experimental validation, characterization data, and reproducibility. Reviewer reports for ACS Nano tend to be focused; 1500 to 3000 word reports are typical.
• Day 49 onward, editorial synthesis and decision: After reports return, the Associate Editor synthesizes them. The 1.8-month total handling time for accepted manuscripts reflects revision rounds and editorial discussion.

• Rejection within 1 to 3 days: Administrative issue or immediate scope mismatch.

• Rejection within 4 to 7 days: Associate Editor desk rejection per the 4-day median.

• Still Under Review after 2 weeks: Strong signal. Paper passed the Associate Editor + EIC screen.

• Still Under Review after 10 weeks: Reviewer-recruitment or reviewer-report delay. A polite inquiry via the ACS Paragon Plus portal is appropriate.

• Status changes to "Decision Pending": Reports are in; expect a decision within 1 week.

This is the most common anxiety we hear from ACS Nano authors during the active editorial window. The honest answer: no, 5 weeks at Under Review puts you right at ACS Nano's 1.1-month first review round median. Reports may already be in editorial synthesis with the Associate Editor preparing the recommendation. Most reviewer-driven delays come from reviewer-recruitment timing for nanoscience subspecialty experts rather than slow reviews.

If the portal still says Under Review at the 8-week mark, the most likely explanation is that one of the assigned reviewers asked for an extension and the Associate Editor granted it. This is normal practice at ACS Nano.

What you should NOT do during the 5-to-8-week window is email the editorial office. ACS Nano Associate Editors are working researchers managing 80+ active papers per year around their own laboratories; an inquiry at 5 weeks adds friction without accelerating the timeline.

If your ACS Nano paper is rejected after review, the natural cascade depends on what the reviewers and Associate Editor cited:

ACS Applied Materials & Interfaces (ACS AMI) is the natural ACS cascade for applied nanomaterials papers where the nanoscience priority bar of ACS Nano is not met but the applied utility is high.

ACS Applied Nano Materials is the ACS cascade for nanomaterials specialty papers.

Nano Letters is the ACS cascade for shorter-format nanoscience papers.

JACS is the broader ACS chemistry flagship. JACS uses ACS Paragon Plus at ACS journal page; editorial contact jacs@acs.org.

Nature Nanotechnology is the external Springer Nature cascade for top-tier nanoscience. The Nature Nanotechnology Manuscript Tracking System at mts-nnano.nature.com handles submission; nnano@nature.com handles publisher-level inquiries.

Advanced Materials / Small are external Wiley cascades for materials-focused nanoscience.

ACS asks reviewers at ACS Nano to evaluate four things specifically. The table below maps each to actionable preparation.

In our pre-submission work with ACS Nano-targeted manuscripts, three named patterns generate the most consistent reviewer concerns and the most common reasons papers miss the editorial bar or fail the desk screen.

Computational-only framing flagged at Associate Editor screen. When the work presents computational nanostructure predictions without experimental validation, Associate Editor desk rejection within 4 days is common. The strongest manuscripts include experimental validation alongside computational results and connect the simulation output to material synthesis, characterization, device behavior, biological response, or mechanistic nanoscience.

Check whether your ACS Nano validation package is strong enough →

Characterization data gaps surface as reviewer concerns. When characterization data is thin (especially missing TEM or SEM particle-size distributions, absent XRD pattern indexing, weak XPS chemical-state confirmation, or incomplete stability testing), reviewers consistently request expanded characterization sections. The strongest revisions add complete characterization data with quantitative analysis, replicate batches, and figure-to-supplement traceability.

Check your ACS Nano characterization readiness →

ACS family cascade offers from Associate Editor. When the Associate Editor concludes the work is rigorous but the nanoscience priority bar of ACS Nano is not met, transfer offers to ACS Applied Materials & Interfaces (applied utility) or ACS Applied Nano Materials (nanomaterials specialty) are common. ACS editors take these transfers seriously, and the decision letter often reveals whether the problem is fixable framing or a structural mismatch between the nanoscience claim and the evidence package.

Check whether your paper fits ACS Nano or an ACS cascade →

We have reviewed 50+ manuscripts targeting ACS Nano, Nano Letters, ACS Applied Materials & Interfaces, ACS Applied Nano Materials, Nature Nanotechnology, and Advanced Materials. This guide tells you what ACS Nano editors look for in the status window, while the review tells you whether your paper passes the same nanoscience-significance, characterization, validation, figure-logic, and cascade-fit checks before the Associate Editor or external reviewers see it. Full Manusights reviews include a 60-day money-back guarantee, and we do not train models on your manuscript.

In our pre-submission review work across nanoscience, materials, and ACS-family targets, ACS Nano-bound drafts most often failed when the central claim depended on characterization that was present but not reviewer-auditable. We see this recur because the Associate Editor can often tell from the first figure and supplement whether the work is a nanoscience advance or an applied-materials result with incomplete evidence.

Source limitation: official guidance explains ACS Nano submission requirements and editorial workflow, but it cannot diagnose whether your specific characterization package is complete enough for ACS Nano rather than ACS AMI or ACS Applied Nano Materials.

This page was created from ACS's public ACS Nano author guidelines at ACS author guidance, ACS Paragon Plus documentation (4-day median for immediate rejections, 1.1-month first review round median, 1.8-month total accepted, Associate Editor selection of peer-review experts, computational nanostructure desk-rejection criterion), SciRev community-reported transit data on ACS Nano, and Manusights pre-submission review experience with ACS Nano-targeted manuscripts.

For the ACS nanoscience landscape beyond ACS Nano, see ACS Applied Materials & Interfaces (applied nanomaterials), ACS Applied Nano Materials (nanomaterials specialty), Nano Letters (short-format nanoscience), JACS (broader ACS chemistry flagship), and external nanoscience alternatives (Nature Nanotechnology, Advanced Materials, Small).

The choice across these titles depends on whether the central contribution is top-tier nanoscience (ACS Nano), applied nanomaterials (ACS AMI), nanomaterials specialty (ACS Applied Nano Materials), short-format nanoscience (Nano Letters), broad ACS chemistry (JACS), top-tier Nature Portfolio (Nature Nanotechnology), or materials-focused (Advanced Materials, Small).

Reviewers at ACS Nano typically draw from 2 to 3 nanoscience subspecialty experts. Editors screen and triage manuscripts before any external reviewer sees them, and preparing a response template that addresses both nanoscience-significance and experimental-validation perspectives accelerates revision rounds substantially.

For a pre-upload check of your manuscript against the ACS Nano nanoscience-priority-plus-experimental-validation bar before submission, our ACS Nano pre-submission diagnostic flags the framing and characterization weaknesses most likely to surface in reviewer reports.